diff --git a/ecs/jskult-webapp/src/templates/instInfo.html b/ecs/jskult-webapp/src/templates/instInfo.html
index 2c5e717f..839f6769 100644
--- a/ecs/jskult-webapp/src/templates/instInfo.html
+++ b/ecs/jskult-webapp/src/templates/instInfo.html
@@ -259,7 +259,7 @@
                 <td class="hpInfoColumn">病床数(定員)</td>
                 <td class="instData"><input type="text" readonly="readonly" value="{{ultmarc.inst_info_data.bed_num or ''}}" class="xSmallTextbox numberBox"></td>
                 <td class="hpInfoColumn captionMenteDate">メンテ年月日</td>
-                <td class="instData menteDate"><input type="text" readonly="readonly" value="{{ultmarc.inst_info_data.prmit_bed_maint_ymd or ''}}" class="menteDateText"></td>
+                <td class="instData menteDate"><input type="text" readonly="readonly" value="{{ultmarc.inst_info_data.prmit_bed_maint_ymd or ''}}" class="menteDateTextbox"></td>
             </tr>
         </tbody>
     </table>