diff --git a/app/Http/Controllers/Auth/RegisterController.php b/app/Http/Controllers/Auth/RegisterController.php
index c68ed7e..d3052d1 100644
--- a/app/Http/Controllers/Auth/RegisterController.php
+++ b/app/Http/Controllers/Auth/RegisterController.php
@@ -51,6 +51,7 @@ class RegisterController extends Controller
             'name' => 'required|string|regex:/^[a-zA-Z0-9_-]+$/u|max:15|unique:users',
             'email' => 'required|string|email|max:255|unique:users',
             'password' => 'required|string|min:6|confirmed',
+            'g-recaptcha-response' => 'required|captcha'
             ],
             ['name.regex' => 'ユーザー名には半角英数字とアンダーバー、ハイフンのみ使用できます。'],
             ['name' => 'ユーザー名']
diff --git a/resources/lang/ja/validation.php b/resources/lang/ja/validation.php
index 7b11851..9c9217f 100644
--- a/resources/lang/ja/validation.php
+++ b/resources/lang/ja/validation.php
@@ -99,6 +99,10 @@ return [
         'attribute-name' => [
             'rule-name' => 'custom-message',
         ],
+        'g-recaptcha-response' => [
+            'required' => '「私はロボットではありません」にチェックを入れてください。',
+            'captcha' => 'reCAPTCHAチェックに失敗しました。何度試しても解決しない場合、管理者にお問い合わせください。',
+        ],
     ],
 
     /*
diff --git a/resources/views/auth/register.blade.php b/resources/views/auth/register.blade.php
index 7ef6a7d..59b2fa9 100644
--- a/resources/views/auth/register.blade.php
+++ b/resources/views/auth/register.blade.php
@@ -2,6 +2,10 @@
 
 @section('title', '新規登録')
 
+@push('head')
+    {!! NoCaptcha::renderJs() !!}
+@endpush
+
 @section('content')
 <div class="container">
     <h2>新規登録</h2>
@@ -53,6 +57,14 @@
                         </div>
                     </div>
                 </div>
+                <div class="form-row ml-1 mt-2 my-4">
+                    <div class="mx-auto">
+                        {!! NoCaptcha::display() !!}
+                    </div>
+                    @if ($errors->has('g-recaptcha-response'))
+                        <div class="invalid-feedback d-block text-center">{{ $errors->first('g-recaptcha-response') }}</div>
+                    @endif
+                </div>
 
                 <div class="text-center">
                     <button class="btn btn-primary btn-lg" type="submit">登録</button>