diff --git a/resources/views/layouts/base.blade.php b/resources/views/layouts/base.blade.php
index 463908e..ed872f1 100644
--- a/resources/views/layouts/base.blade.php
+++ b/resources/views/layouts/base.blade.php
@@ -46,7 +46,7 @@
                 </ul>
                 <form action="{{ stripos(Route::currentRouteName(), 'search') === 0 ? route(Route::currentRouteName()) : route('search') }}" class="form-inline mr-2">
                     <div class="input-group">
-                        <input type="search" name="q" class="form-control" placeholder="検索..." value="{{ stripos(Route::currentRouteName(), 'search') === 0 ? $inputs['q'] : '' }}">
+                        <input type="search" name="q" class="form-control" placeholder="検索..." value="{{ stripos(Route::currentRouteName(), 'search') === 0 ? $inputs['q'] : '' }}" required>
                         <div class="input-group-append">
                             <button class="btn btn-outline-secondary" type="submit"><span class="oi oi-magnifying-glass" aria-hidden="true"></span><span class="sr-only">検索</span></button>
                         </div>