diff --git a/views/select.erb b/views/select.erb
index 969275f..55120ea 100644
--- a/views/select.erb
+++ b/views/select.erb
@@ -38,7 +38,7 @@
       <form method="POST" action="/setteam">
         <div class="form-group col-md-4 mt-4">
          <label for="inputTeam" class="h1">自分のチーム</label>
-        <select name="t_num" id="inputTeam" class="custom-select custom-select-lg">
+        <select name="t_num" id="inputTeam" class="custom-select custom-select-lg" required>
           <option value="" selected>チーム選択</option>
           <option value="1">チーム1</option>
           <option value="2">チーム2</option>