diff --git a/app/Http/Controllers/TodoController.php b/app/Http/Controllers/TodoController.php
index 1d934b7..23cd852 100644
--- a/app/Http/Controllers/TodoController.php
+++ b/app/Http/Controllers/TodoController.php
@@ -31,6 +31,12 @@
      */
     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..24c4a34 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;
     }
 
     /**
@@ -22,7 +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..bf37850 100644
--- a/app/Models/Todo.php
+++ b/app/Models/Todo.php
@@ -9,4 +9,11 @@
 {
     /** @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 bc19926..381af77 100644
--- a/resources/views/todo/index.blade.php
+++ b/resources/views/todo/index.blade.php
@@ -1,4 +1,11 @@
 <x-layouts.app :title="__('Todo')">
+    @if (session('message.success'))
+        <div class="m-4">
+            <div class="p-4 bg-cyan-200 text-blue-500 rounded-md text-2xl">
+                {{ session('message.success') }}
+            </div>
+        </div>
+    @endif
     <div class="flex h-full w-full flex-1 flex-col gap-4 rounded-xl">
         <div class="mx-4">
             <table class="min-w-full divide-y divide-gray-200">
@@ -24,5 +31,17 @@
                 </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>
+
     </div>
 </x-layouts.app>