diff --git a/app/Console/Commands/DemoteUser.php b/app/Console/Commands/DemoteUser.php
new file mode 100644
index 0000000..94dfe58
--- /dev/null
+++ b/app/Console/Commands/DemoteUser.php
@@ -0,0 +1,61 @@
+<?php
+
+namespace App\Console\Commands;
+
+use App\User;
+use Illuminate\Console\Command;
+
+class DemoteUser extends Command
+{
+    /**
+     * The name and signature of the console command.
+     *
+     * @var string
+     */
+    protected $signature = 'tissue:user:demote {username}';
+
+    /**
+     * The console command description.
+     *
+     * @var string
+     */
+    protected $description = 'Demote admin to user';
+
+    /**
+     * Create a new command instance.
+     *
+     * @return void
+     */
+    public function __construct()
+    {
+        parent::__construct();
+    }
+
+    /**
+     * Execute the console command.
+     *
+     * @return mixed
+     */
+    public function handle()
+    {
+        $user = User::where('name', $this->argument('username'))->first();
+        if ($user === null) {
+            $this->error('No user with such username');
+
+            return 1;
+        }
+
+        if (!$user->is_admin) {
+            $this->info('@' . $user->name . ' is already an user.');
+
+            return 0;
+        }
+
+        $user->is_admin = false;
+        if ($user->save()) {
+            $this->info('@' . $user->name . ' is an user now.');
+        } else {
+            $this->error('Something happened.');
+        }
+    }
+}
diff --git a/app/Console/Commands/PromoteUser.php b/app/Console/Commands/PromoteUser.php
new file mode 100644
index 0000000..b737ca5
--- /dev/null
+++ b/app/Console/Commands/PromoteUser.php
@@ -0,0 +1,61 @@
+<?php
+
+namespace App\Console\Commands;
+
+use App\User;
+use Illuminate\Console\Command;
+
+class PromoteUser extends Command
+{
+    /**
+     * The name and signature of the console command.
+     *
+     * @var string
+     */
+    protected $signature = 'tissue:user:promote {username}';
+
+    /**
+     * The console command description.
+     *
+     * @var string
+     */
+    protected $description = 'Promote user to admin';
+
+    /**
+     * Create a new command instance.
+     *
+     * @return void
+     */
+    public function __construct()
+    {
+        parent::__construct();
+    }
+
+    /**
+     * Execute the console command.
+     *
+     * @return mixed
+     */
+    public function handle()
+    {
+        $user = User::where('name', $this->argument('username'))->first();
+        if ($user === null) {
+            $this->error('No user with such username');
+
+            return 1;
+        }
+
+        if ($user->is_admin) {
+            $this->info('@' . $user->name . ' is already an administrator.');
+
+            return 0;
+        }
+
+        $user->is_admin = true;
+        if ($user->save()) {
+            $this->info('@' . $user->name . ' is an administrator now.');
+        } else {
+            $this->error('Something happened.');
+        }
+    }
+}
diff --git a/app/Console/Kernel.php b/app/Console/Kernel.php
index 622e774..da3f264 100644
--- a/app/Console/Kernel.php
+++ b/app/Console/Kernel.php
@@ -2,6 +2,8 @@
 
 namespace App\Console;
 
+use App\Console\Commands\DemoteUser;
+use App\Console\Commands\PromoteUser;
 use Illuminate\Console\Scheduling\Schedule;
 use Illuminate\Foundation\Console\Kernel as ConsoleKernel;
 
@@ -35,6 +37,8 @@ class Kernel extends ConsoleKernel
      */
     protected function commands()
     {
+        $this->load(__DIR__.'/Commands');
+
         require base_path('routes/console.php');
     }
 }
diff --git a/app/Http/Controllers/Admin/DashboardController.php b/app/Http/Controllers/Admin/DashboardController.php
new file mode 100644
index 0000000..b09d0c8
--- /dev/null
+++ b/app/Http/Controllers/Admin/DashboardController.php
@@ -0,0 +1,14 @@
+<?php
+
+namespace App\Http\Controllers\Admin;
+
+use App\Http\Controllers\Controller;
+use Illuminate\Http\Request;
+
+class DashboardController extends Controller
+{
+    public function index()
+    {
+        return view('admin.dashboard');
+    }
+}
diff --git a/app/Http/Controllers/Admin/InfoController.php b/app/Http/Controllers/Admin/InfoController.php
new file mode 100644
index 0000000..faf2909
--- /dev/null
+++ b/app/Http/Controllers/Admin/InfoController.php
@@ -0,0 +1,75 @@
+<?php
+
+namespace App\Http\Controllers\Admin;
+
+use App\Http\Controllers\Controller;
+use App\Http\Requests\AdminInfoStoreRequest;
+use App\Information;
+use Illuminate\Http\Request;
+use Illuminate\Support\Facades\Validator;
+use Illuminate\Validation\Rule;
+
+class InfoController extends Controller
+{
+    public function index()
+    {
+        $informations = Information::query()
+            ->select('id', 'category', 'pinned', 'title', 'created_at')
+            ->orderByDesc('pinned')
+            ->orderByDesc('created_at')
+            ->paginate(20);
+
+        return view('admin.info.index')->with([
+            'informations' => $informations,
+            'categories' => Information::CATEGORIES
+        ]);
+    }
+
+    public function create()
+    {
+        return view('admin.info.create')->with([
+            'categories' => Information::CATEGORIES
+        ]);
+    }
+
+    public function store(AdminInfoStoreRequest $request)
+    {
+        $inputs = $request->all();
+        if (!$request->has('pinned')) {
+            $inputs['pinned'] = false;
+        }
+
+        $info = Information::create($inputs);
+
+        return redirect()->route('admin.info.edit', ['info' => $info])->with('status', 'お知らせを更新しました。');
+    }
+
+    public function edit($id)
+    {
+        $information = Information::findOrFail($id);
+
+        return view('admin.info.edit')->with([
+            'info' => $information,
+            'categories' => Information::CATEGORIES
+        ]);
+    }
+
+    public function update(AdminInfoStoreRequest $request, Information $info)
+    {
+        $inputs = $request->all();
+        if (!$request->has('pinned')) {
+            $inputs['pinned'] = false;
+        }
+
+        $info->fill($inputs)->save();
+
+        return redirect()->route('admin.info.edit', ['info' => $info])->with('status', 'お知らせを更新しました。');
+    }
+
+    public function destroy(Information $info)
+    {
+        $info->delete();
+
+        return redirect()->route('admin.info')->with('status', 'お知らせを削除しました。');
+    }
+}
diff --git a/app/Http/Requests/AdminInfoStoreRequest.php b/app/Http/Requests/AdminInfoStoreRequest.php
new file mode 100644
index 0000000..45b3d2e
--- /dev/null
+++ b/app/Http/Requests/AdminInfoStoreRequest.php
@@ -0,0 +1,35 @@
+<?php
+
+namespace App\Http\Requests;
+
+use App\Information;
+use Illuminate\Foundation\Http\FormRequest;
+use Illuminate\Validation\Rule;
+
+class AdminInfoStoreRequest extends FormRequest
+{
+    /**
+     * Determine if the user is authorized to make this request.
+     *
+     * @return bool
+     */
+    public function authorize()
+    {
+        return true;
+    }
+
+    /**
+     * Get the validation rules that apply to the request.
+     *
+     * @return array
+     */
+    public function rules()
+    {
+        return [
+            'category' => ['required', Rule::in(array_keys(Information::CATEGORIES))],
+            'pinned' => 'nullable|boolean',
+            'title' => 'required|string|max:255',
+            'content' => 'required|string|max:10000'
+        ];
+    }
+}
diff --git a/app/Information.php b/app/Information.php
index e0ae6ed..2b237fb 100644
--- a/app/Information.php
+++ b/app/Information.php
@@ -16,5 +16,9 @@ class Information extends Model
         3 => ['label' => 'メンテナンス', 'class' => 'badge-warning']
     ];
 
+    protected $fillable = [
+        'category', 'pinned', 'title', 'content'
+    ];
+
     protected $dates = ['deleted_at'];
 }
diff --git a/app/Providers/AuthServiceProvider.php b/app/Providers/AuthServiceProvider.php
index e12ff88..600ff72 100644
--- a/app/Providers/AuthServiceProvider.php
+++ b/app/Providers/AuthServiceProvider.php
@@ -25,6 +25,8 @@ class AuthServiceProvider extends ServiceProvider
     {
         $this->registerPolicies();
 
-        //
+        Gate::define('admin', function ($user) {
+            return $user->is_admin;
+        });
     }
 }
diff --git a/database/migrations/2019_02_11_140657_add_is_admin_to_users.php b/database/migrations/2019_02_11_140657_add_is_admin_to_users.php
new file mode 100644
index 0000000..2b37986
--- /dev/null
+++ b/database/migrations/2019_02_11_140657_add_is_admin_to_users.php
@@ -0,0 +1,32 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+class AddIsAdminToUsers extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::table('users', function (Blueprint $table) {
+            $table->boolean('is_admin')->default(false);
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        Schema::table('users', function (Blueprint $table) {
+            $table->dropColumn('is_admin');
+        });
+    }
+}
diff --git a/public/dashboard.png b/public/dashboard.png
new file mode 100644
index 0000000..c85ca1c
Binary files /dev/null and b/public/dashboard.png differ
diff --git a/resources/lang/ja/validation.php b/resources/lang/ja/validation.php
index ecf3a03..d154816 100644
--- a/resources/lang/ja/validation.php
+++ b/resources/lang/ja/validation.php
@@ -119,6 +119,8 @@ return [
     'attributes' => [
         'email' => 'メールアドレス',
         'password' => 'パスワード',
+        'title' => 'タイトル',
+        'content' => '本文',
     ],
 
 ];
diff --git a/resources/views/admin/dashboard.blade.php b/resources/views/admin/dashboard.blade.php
new file mode 100644
index 0000000..beb9602
--- /dev/null
+++ b/resources/views/admin/dashboard.blade.php
@@ -0,0 +1,10 @@
+@extends('layouts.admin')
+
+@section('title', 'ダッシュボード')
+
+@section('tab-content')
+    <div class="container d-flex flex-column align-items-center">
+        <img src="{{ asset('dashboard.png') }}" class="w-50"/>
+        <p class="text-muted">TODO: 役に立つ情報を表示する</p>
+    </div>
+@endsection
\ No newline at end of file
diff --git a/resources/views/admin/info/create.blade.php b/resources/views/admin/info/create.blade.php
new file mode 100644
index 0000000..576b7ab
--- /dev/null
+++ b/resources/views/admin/info/create.blade.php
@@ -0,0 +1,54 @@
+@extends('layouts.admin')
+
+@section('title', 'お知らせ')
+
+@section('tab-content')
+    <div class="container">
+        <h2>お知らせの作成</h2>
+        <hr>
+        <form action="{{ route('admin.info.store') }}" method="post">
+            {{ csrf_field() }}
+
+            <div class="row">
+                <div class="form-group col-12 col-lg-6">
+                    <label for="category">カテゴリ</label>
+                    <select id="category" name="category" class="form-control">
+                        @foreach($categories as $id => $category)
+                            <option value="{{ $id }}" {{ old('category') == $id ? 'selected' : '' }}>{{ $category['label'] }}</option>
+                        @endforeach
+                    </select>
+                </div>
+                <div class="form-group col-12 col-lg-6 d-flex flex-column justify-content-center">
+                    <div class="custom-control custom-checkbox">
+                        <input id="pinned" name="pinned" type="checkbox" class="custom-control-input" value="1"
+                                {{ old('pinned') ? 'checked' : ''}}>
+                        <label for="pinned" class="custom-control-label">ピン留め (常に優先表示) する</label>
+                    </div>
+                </div>
+            </div>
+            <div class="form-group">
+                <label for="title">タイトル</label>
+                <input id="title" name="title" type="text" class="form-control {{ $errors->has('title') ? ' is-invalid' : '' }}" value="{{ old('title') }}">
+                
+                @if ($errors->has('title'))
+                    <div class="invalid-feedback">{{ $errors->first('title') }}</div>
+                @endif
+            </div>
+            <div class="form-group mt-3">
+                <label for="content">本文</label>
+                <textarea id="content" name="content" rows="15" class="form-control  {{ $errors->has('content') ? ' is-invalid' : '' }}" maxlength="10000">{{ old('content') }}</textarea>
+                <small class="form-text text-muted">
+                    最大 10000 文字、Markdown 形式
+                </small>
+
+                @if ($errors->has('content'))
+                    <div class="invalid-feedback">{{ $errors->first('content') }}</div>
+                @endif
+            </div>
+
+            <div class="d-flex justify-content-between">
+                <button type="submit" class="btn btn-primary">登録</button>
+            </div>
+        </form>
+    </div>
+@endsection
\ No newline at end of file
diff --git a/resources/views/admin/info/edit.blade.php b/resources/views/admin/info/edit.blade.php
new file mode 100644
index 0000000..d5eb513
--- /dev/null
+++ b/resources/views/admin/info/edit.blade.php
@@ -0,0 +1,60 @@
+@extends('layouts.admin')
+
+@section('title', 'お知らせ')
+
+@section('tab-content')
+    <div class="container">
+        <h2>お知らせの編集</h2>
+        <hr>
+        <form action="{{ route('admin.info.update', ['info' => $info]) }}" method="post">
+            {{ method_field('PUT') }}
+            {{ csrf_field() }}
+
+            <div class="row">
+                <div class="form-group col-12 col-lg-6">
+                    <label for="category">カテゴリ</label>
+                    <select id="category" name="category" class="form-control">
+                        @foreach($categories as $id => $category)
+                            <option value="{{ $id }}" {{ (old('category') ?? $info->category) == $id ? 'selected' : '' }}>{{ $category['label'] }}</option>
+                        @endforeach
+                    </select>
+                </div>
+                <div class="form-group col-12 col-lg-6 d-flex flex-column justify-content-center">
+                    <div class="custom-control custom-checkbox">
+                        <input id="pinned" name="pinned" type="checkbox" class="custom-control-input" value="1"
+                                {{ (is_bool(old('pinned')) ? old('pinned') : $info->pinned) ? 'checked' : ''}}>
+                        <label for="pinned" class="custom-control-label">ピン留め (常に優先表示) する</label>
+                    </div>
+                </div>
+            </div>
+            <div class="form-group">
+                <label for="title">タイトル</label>
+                <input id="title" name="title" type="text" class="form-control {{ $errors->has('title') ? ' is-invalid' : '' }}" value="{{ old('title') ?? $info->title }}">
+
+                @if ($errors->has('title'))
+                    <div class="invalid-feedback">{{ $errors->first('title') }}</div>
+                @endif
+            </div>
+            <div class="form-group mt-3">
+                <label for="content">本文</label>
+                <textarea id="content" name="content" rows="15" class="form-control {{ $errors->has('content') ? ' is-invalid' : '' }}" maxlength="10000">{{ old('content') ?? $info->content }}</textarea>
+                <small class="form-text text-muted">
+                    最大 10000 文字、Markdown 形式
+                </small>
+
+                @if ($errors->has('content'))
+                    <div class="invalid-feedback">{{ $errors->first('content') }}</div>
+                @endif
+            </div>
+
+            <div class="d-flex justify-content-between">
+                <button type="submit" class="btn btn-primary">更新</button>
+                <button type="submit" class="btn btn-danger" form="delete-form">削除</button>
+            </div>
+        </form>
+        <form id="delete-form" action="{{ route('admin.info.destroy', ['info' => $info]) }}" method="post">
+            {{ method_field('DELETE') }}
+            {{ csrf_field() }}
+        </form>
+    </div>
+@endsection
\ No newline at end of file
diff --git a/resources/views/admin/info/index.blade.php b/resources/views/admin/info/index.blade.php
new file mode 100644
index 0000000..8d5ae40
--- /dev/null
+++ b/resources/views/admin/info/index.blade.php
@@ -0,0 +1,57 @@
+@extends('layouts.admin')
+
+@section('title', 'お知らせ')
+
+@section('tab-content')
+    <div class="container">
+        <h2>お知らせ</h2>
+        <hr>
+        <div class="d-flex mb-3">
+            <a href="{{ route('admin.info.create') }}" class="btn btn-primary">新規作成</a>
+        </div>
+        <table class="table table-sm">
+            <thead>
+            <tr>
+                <th>カテゴリ</th>
+                <th>タイトル</th>
+                <th>作成日</th>
+            </tr>
+            </thead>
+            <tbody>
+            @foreach($informations as $info)
+                <tr>
+                    <td>
+                        @if ($info->pinned)
+                            <span class="badge badge-secondary"><span class="oi oi-pin"></span>ピン留め</span>
+                        @endif
+                        <span class="badge {{ $categories[$info->category]['class'] }}">{{ $categories[$info->category]['label'] }}</span>
+                    </td>
+                    <td>
+                        <a href="{{ route('admin.info.edit', ['id' => $info->id]) }}">{{ $info->title }}</a>
+                    </td>
+                    <td>
+                        {{ $info->created_at->format('Y年n月j日') }}
+                    </td>
+                </tr>
+            @endforeach
+            </tbody>
+        </table>
+        <ul class="pagination mt-4 justify-content-center">
+            <li class="page-item {{ $informations->currentPage() === 1 ? 'disabled' : '' }}">
+                <a class="page-link" href="{{ $informations->previousPageUrl() }}" aria-label="Previous">
+                    <span aria-hidden="true">&laquo;</span>
+                    <span class="sr-only">Previous</span>
+                </a>
+            </li>
+            @for ($i = 1; $i <= $informations->lastPage(); $i++)
+                <li class="page-item {{ $i === $informations->currentPage() ? 'active' : '' }}"><a href="{{ $informations->url($i) }}" class="page-link">{{ $i }}</a></li>
+            @endfor
+            <li class="page-item {{ $informations->currentPage() === $informations->lastPage() ? 'disabled' : '' }}">
+                <a class="page-link" href="{{ $informations->nextPageUrl() }}" aria-label="Next">
+                    <span aria-hidden="true">&raquo;</span>
+                    <span class="sr-only">Next</span>
+                </a>
+            </li>
+        </ul>
+    </div>
+@endsection
\ No newline at end of file
diff --git a/resources/views/layouts/admin.blade.php b/resources/views/layouts/admin.blade.php
new file mode 100644
index 0000000..45fa2b5
--- /dev/null
+++ b/resources/views/layouts/admin.blade.php
@@ -0,0 +1,20 @@
+@extends('layouts.base')
+
+@section('content')
+    <div class="container">
+        <div class="row">
+            <div class="col-lg-3">
+                <div class="list-group mb-4">
+                    <div class="list-group-item disabled font-weight-bold">管理</div>
+                    <a class="list-group-item list-group-item-action {{ Route::is('admin.dashboard') ? 'active' : '' }}"
+                       href="{{ route('admin.dashboard') }}"><span class="oi oi-dashboard mr-1"></span> ダッシュボード</a>
+                    <a class="list-group-item list-group-item-action {{ Route::is('admin.info*') ? 'active' : '' }}"
+                       href="{{ route('admin.info') }}"><span class="oi oi-bullhorn mr-1"></span> お知らせ</a>
+                </div>
+            </div>
+            <div class="tab-content col-lg-9">
+                @yield('tab-content')
+            </div>
+        </div>
+    </div>
+@endsection
\ No newline at end of file
diff --git a/resources/views/layouts/base.blade.php b/resources/views/layouts/base.blade.php
index 3aabcb2..1c524af 100644
--- a/resources/views/layouts/base.blade.php
+++ b/resources/views/layouts/base.blade.php
@@ -105,6 +105,9 @@
                                 </a>
                                 <div class="dropdown-divider"></div>
                                 <a href="{{ route('setting') }}" class="dropdown-item">設定</a>
+                                @can ('admin')
+                                    <a href="{{ route('admin.dashboard') }}" class="dropdown-item">管理</a>
+                                @endcan
                                 <a href="{{ route('logout') }}" class="dropdown-item" onclick="event.preventDefault(); document.getElementById('logout-form').submit();">ログアウト</a>
                             </div>
                         </li>
diff --git a/routes/web.php b/routes/web.php
index a772f46..23eca8e 100644
--- a/routes/web.php
+++ b/routes/web.php
@@ -44,3 +44,17 @@ Route::get('/info/{id}', 'InfoController@show')->where('id', '[0-9]+')->name('in
 Route::redirect('/search', '/search/checkin', 301);
 Route::get('/search/checkin', 'SearchController@index')->name('search');
 Route::get('/search/related-tag', 'SearchController@relatedTag')->name('search.related-tag');
+
+Route::middleware('can:admin')
+    ->namespace('Admin')
+    ->prefix('admin')
+    ->name('admin.')
+    ->group(function () {
+        Route::get('/', 'DashboardController@index')->name('dashboard');
+        Route::get('/info', 'InfoController@index')->name('info');
+        Route::get('/info/create', 'InfoController@create')->name('info.create');
+        Route::post('/info', 'InfoController@store')->name('info.store');
+        Route::get('/info/{info}', 'InfoController@edit')->name('info.edit');
+        Route::put('/info/{info}', 'InfoController@update')->name('info.update');
+        Route::delete('/info/{info}', 'InfoController@destroy')->name('info.destroy');
+    });