diff --git a/ecs/jskult-webapp/src/static/css/masterMainte.css b/ecs/jskult-webapp/src/static/css/masterMainte.css
index 863a9835..07f8bbe8 100644
--- a/ecs/jskult-webapp/src/static/css/masterMainte.css
+++ b/ecs/jskult-webapp/src/static/css/masterMainte.css
@@ -31,6 +31,7 @@ h1{
 }
 
 .csvup_buttonSize{
+    width: 7rem;
     font-size: initial;
 }
 .buttonSize{
diff --git a/ecs/jskult-webapp/src/templates/instEmpCsvUL.html b/ecs/jskult-webapp/src/templates/instEmpCsvUL.html
index 9cdca845..35ae1087 100644
--- a/ecs/jskult-webapp/src/templates/instEmpCsvUL.html
+++ b/ecs/jskult-webapp/src/templates/instEmpCsvUL.html
@@ -41,7 +41,7 @@
                 <td class="headerTdLeft">施設担当者データCSVアップロード</td>
                 <td class="headerTdRight">
                     {% if mainte_csv_up.is_verified and mainte_csv_up.is_error_message_list_empty()  %}
-                        <input type="button" onclick="location.href='/masterMainte/instEmpCsvUL' " value="戻る">
+                        <input type="button" class="csvup_buttonSize" onclick="location.href='/masterMainte/instEmpCsvUL' " value="戻る">
                     {% else %}
                         <input type="button" class="csvup_buttonSize" onclick="backToMainteMenu()" value="メニューへ" />
                     {% endif %}