diff --git a/app/Http/Controllers/Admin/InfoController.php b/app/Http/Controllers/Admin/InfoController.php
index 6a1c7c7..744da19 100644
--- a/app/Http/Controllers/Admin/InfoController.php
+++ b/app/Http/Controllers/Admin/InfoController.php
@@ -5,6 +5,8 @@ namespace App\Http\Controllers\Admin;
 use App\Information;
 use Illuminate\Http\Request;
 use App\Http\Controllers\Controller;
+use Illuminate\Support\Facades\Validator;
+use Illuminate\Validation\Rule;
 
 class InfoController extends Controller
 {
@@ -24,7 +26,32 @@ class InfoController extends Controller
 
     public function create()
     {
-        // TODO
+        return view('admin.info.create')->with([
+            'categories' => Information::CATEGORIES
+        ]);
+    }
+
+    public function store(Request $request)
+    {
+        $inputs = $request->all();
+        if ($request->has('content')) {
+            $inputs['content'] = str_replace(["\r\n", "\r"], "\n", $inputs['content']);
+        }
+        if (!$request->has('pinned')) {
+            $inputs['pinned'] = false;
+        }
+
+        // TODO: #updateと全く同じだし、フォームリクエストにしたほうがよいのでは？
+        Validator::make($inputs, [
+            'category' => ['required', Rule::in(array_keys(Information::CATEGORIES))],
+            'pinned' => 'nullable|boolean',
+            'title' => 'required|string|max:255',
+            'content' => 'required|string|max:10000'
+        ])->validate();
+
+        $info = Information::create($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)
@@ -37,8 +64,32 @@ class InfoController extends Controller
         ]);
     }
 
-    public function update(Request $request)
+    public function update(Request $request, Information $info)
     {
-        // TODO
+        $inputs = $request->all();
+        if ($request->has('content')) {
+            $inputs['content'] = str_replace(["\r\n", "\r"], "\n", $inputs['content']);
+        }
+        if (!$request->has('pinned')) {
+            $inputs['pinned'] = false;
+        }
+
+        Validator::make($inputs, [
+            'category' => ['required', Rule::in(array_keys(Information::CATEGORIES))],
+            'pinned' => 'nullable|boolean',
+            'title' => 'required|string|max:255',
+            'content' => 'required|string|max:10000'
+        ])->validate();
+
+        $info->fill($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/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 $dates = ['deleted_at'];
 }
diff --git a/resources/views/admin/info/create.blade.php b/resources/views/admin/info/create.blade.php
new file mode 100644
index 0000000..4bdb53e
--- /dev/null
+++ b/resources/views/admin/info/create.blade.php
@@ -0,0 +1,46 @@
+@extends('layouts.admin')
+
+@section('title', 'お知らせ')
+
+@section('tab-content')
+    <div class="container">
+        <h2>お知らせの作成</h2>
+        <hr>
+        <form action="{{ route('admin.info.store') }}" method="post">
+            {{ csrf_field() }}
+
+            <div class="row">
+                <div class="form-group col-12 col-lg-6">
+                    <label for="category">カテゴリ</label>
+                    <select id="category" name="category" class="form-control">
+                        @foreach($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" value="{{ old('title') }}">
+            </div>
+            <div class="form-group mt-3">
+                <label for="content">本文</label>
+                <textarea id="content" name="content" rows="15" class="form-control" maxlength="10000">{{ old('content') }}</textarea>
+                <small class="form-text text-muted">
+                    最大 10000 文字、Markdown 形式
+                </small>
+            </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
index ff3e588..dc56cea 100644
--- a/resources/views/admin/info/edit.blade.php
+++ b/resources/views/admin/info/edit.blade.php
@@ -6,7 +6,7 @@
     <div class="container">
         <h2>お知らせの編集</h2>
         <hr>
-        <form action="{{ route('admin.info.update', ['id' => $info->id]) }}" method="post">
+        <form action="{{ route('admin.info.update', ['info' => $info]) }}" method="post">
             {{ method_field('PUT') }}
             {{ csrf_field() }}
 
@@ -15,13 +15,13 @@
                     <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 ? 'checked' : '' }}>{{ $category['label'] }}</option>
+                            <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" type="checkbox" class="custom-control-input"
+                        <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>
@@ -41,8 +41,12 @@
 
             <div class="d-flex justify-content-between">
                 <button type="submit" class="btn btn-primary">更新</button>
-                <button type="button" class="btn btn-danger">削除</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/routes/web.php b/routes/web.php
index 6f9bfb4..23eca8e 100644
--- a/routes/web.php
+++ b/routes/web.php
@@ -53,6 +53,8 @@ Route::middleware('can:admin')
         Route::get('/', 'DashboardController@index')->name('dashboard');
         Route::get('/info', 'InfoController@index')->name('info');
         Route::get('/info/create', 'InfoController@create')->name('info.create');
-        Route::get('/info/{id}', 'InfoController@edit')->name('info.edit');
-        Route::put('/info/{id}', 'InfoController@update')->name('info.update');
+        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');
     });