diff --git a/src/main/resources/templates/password_reset.html b/src/main/resources/templates/password_reset.html
index 6d350be..453a9db 100644
--- a/src/main/resources/templates/password_reset.html
+++ b/src/main/resources/templates/password_reset.html
@@ -38,7 +38,7 @@
                                class="form-control"
                                th:field="*{password}"
                                minlength="8"
-                               maxlength="255"
+                               maxlength="24"
                                required>
 
                     </div>
@@ -55,7 +55,7 @@
                                class="form-control"
                                th:field="*{passwordConfirm}"
                                minlength="8"
-                               maxlength="255"
+                               maxlength="24"
                                required>
 
                     </div>
diff --git a/src/main/resources/templates/user_register.html b/src/main/resources/templates/user_register.html
index b8e3c0a..b8067b4 100644
--- a/src/main/resources/templates/user_register.html
+++ b/src/main/resources/templates/user_register.html
@@ -86,7 +86,7 @@
                                class="form-control"
                                th:field="*{password}"
                                minlength="8"
-                               maxlength="255"
+                               maxlength="24"
                                required>
                     </div>
 
diff --git a/src/main/resources/templates/user_register_confirm.html b/src/main/resources/templates/user_register_confirm.html
index 80a4348..6d39145 100644
--- a/src/main/resources/templates/user_register_confirm.html
+++ b/src/main/resources/templates/user_register_confirm.html
@@ -39,7 +39,7 @@
 			<div class="mb-3">
 				<label for="password" class="form-label">パスワード</label>
 				<input type="password" id="password" class="form-control" name="password" th:value="*{password}" minlength="8"
-					maxlength="255" required readonly>
+					maxlength="24" required readonly>
 			</div>
 
 			<div class="mb-3">
diff --git a/src/main/resources/templates/user_register_return.html b/src/main/resources/templates/user_register_return.html
index 3863a24..272432d 100644
--- a/src/main/resources/templates/user_register_return.html
+++ b/src/main/resources/templates/user_register_return.html
@@ -54,7 +54,7 @@
 				class="form-control"
 				th:value="*{password}"
 				minlength="8"
-				maxlength="255"
+				maxlength="24"
 				required>
 			</div>