diff --git a/app/Http/Controllers/TodoController.php b/app/Http/Controllers/TodoController.php
index 7819702..cac6eb2 100644
--- a/app/Http/Controllers/TodoController.php
+++ b/app/Http/Controllers/TodoController.php
@@ -32,6 +32,12 @@
      */
     public function store(StoreTodoRequest $request)
     {
+        // info($request->all()); // ~/Herd/my-new-site/storage/logs などに出力する。フォームが何を送信しているか確認できる。
+        Todo::create([
+            'user_id' => auth()->id(),
+            'task' => $request->task,
+        ]);
+        return redirect()->route('todo.index')->with('message.success', 'Todo created successfully!');
         //
     }
 
diff --git a/app/Http/Requests/StoreTodoRequest.php b/app/Http/Requests/StoreTodoRequest.php
index 0731f85..9941f44 100644
--- a/app/Http/Requests/StoreTodoRequest.php
+++ b/app/Http/Requests/StoreTodoRequest.php
@@ -11,7 +11,7 @@
      */
     public function authorize(): bool
     {
-        return false;
+        return true; // ここをtrueにしないと、403 This action is unauthorized.になります。
     }
 
     /**
@@ -22,6 +22,7 @@
     public function rules(): array
     {
         return [
+            'task' => 'required|string|max:255',
             //
         ];
     }
diff --git a/app/Models/Todo.php b/app/Models/Todo.php
index 2163c9b..8e2da93 100644
--- a/app/Models/Todo.php
+++ b/app/Models/Todo.php
@@ -9,4 +9,12 @@
 {
     /** @use HasFactory<\Database\Factories\TodoFactory> */
     use HasFactory;
+
+    /**
+     * fillable 配列が定義されていないと、データを保存する際にエラーが発生します。
+     */
+    protected $fillable = [
+        'task',
+    ];
+
 }
diff --git a/resources/views/todo/index.blade.php b/resources/views/todo/index.blade.php
index f933db7..18b48f3 100644
--- a/resources/views/todo/index.blade.php
+++ b/resources/views/todo/index.blade.php
@@ -5,6 +5,14 @@
         </h2>
     </x-slot>
 
+    <div class="m-4">
+        @if (session('message.success'))
+            <div class="p-4 bg-cyan-200 text-blue-500 rounded-md text-2xl">
+                {{ session('message.success') }}
+            </div>
+        @endif
+    </div>
+
     <div class="mx-4">
         <table class="min-w-full divide-y divide-gray-200">
             <thead>
@@ -29,4 +37,14 @@
             </tbody>
         </table>
     </div>
+
+    <div class="m-4">
+        <form action="{{ route('todo.store') }}" method="POST">
+            @csrf
+            <div class="flex items-center">
+                <input type="text" name="task" class="w-full p-2 border border-gray-300 rounded-md" placeholder="Add a new task">
+                <button type="submit" class="p-2 ml-2 bg-blue-500 text-white rounded-md">Add</button>
+            </div>
+        </form>
+    </div>
 </x-app-layout>