diff --git a/dictation_client/src/pages/WorkTypeIdSettingPage/addWorktypeIdPopup.tsx b/dictation_client/src/pages/WorkTypeIdSettingPage/addWorktypeIdPopup.tsx
index 7f4934f..bf0f407 100644
--- a/dictation_client/src/pages/WorkTypeIdSettingPage/addWorktypeIdPopup.tsx
+++ b/dictation_client/src/pages/WorkTypeIdSettingPage/addWorktypeIdPopup.tsx
@@ -85,7 +85,7 @@ export const AddWorktypeIdPopup: React.FC<AddWorktypeIdPopupProps> = (
               <input
                 type="text"
                 size={40}
-                maxLength={255}
+                maxLength={16}
                 value={worktypeId ?? ""}
                 className={styles.formInput}
                 onChange={(e) => {
diff --git a/dictation_client/src/pages/WorkTypeIdSettingPage/editWorktypeIdPopup.tsx b/dictation_client/src/pages/WorkTypeIdSettingPage/editWorktypeIdPopup.tsx
index 248005b..a3d4fee 100644
--- a/dictation_client/src/pages/WorkTypeIdSettingPage/editWorktypeIdPopup.tsx
+++ b/dictation_client/src/pages/WorkTypeIdSettingPage/editWorktypeIdPopup.tsx
@@ -84,7 +84,7 @@ export const EditWorktypeIdPopup: React.FC<EditWorktypeIdPopupProps> = (
               <input
                 type="text"
                 size={40}
-                maxLength={255}
+                maxLength={16}
                 value={worktypeId ?? ""}
                 className={styles.formInput}
                 onChange={(e) => {
diff --git a/dictation_server/src/features/accounts/types/types.ts b/dictation_server/src/features/accounts/types/types.ts
index e0202f7..2648785 100644
--- a/dictation_server/src/features/accounts/types/types.ts
+++ b/dictation_server/src/features/accounts/types/types.ts
@@ -198,7 +198,7 @@ export class CancelIssueRequest {
 export class CreateWorktypesRequest {
   @ApiProperty({ minLength: 1, maxLength: 255, description: 'WorktypeID' })
   @MinLength(1)
-  @MaxLength(255)
+  @MaxLength(16)
   @IsRecorderAllowed()
   worktypeId: string;
   @ApiProperty({ description: 'Worktypeの説明', required: false })
@@ -210,7 +210,7 @@ export class CreateWorktypesRequest {
 export class UpdateWorktypesRequest {
   @ApiProperty({ minLength: 1, description: 'WorktypeID' })
   @MinLength(1)
-  @MaxLength(255)
+  @MaxLength(16)
   @IsRecorderAllowed()
   worktypeId: string;
   @ApiProperty({ description: 'Worktypeの説明', required: false })