diff --git a/dictation_server/src/constants/index.ts b/dictation_server/src/constants/index.ts
index 817059d..3548667 100644
--- a/dictation_server/src/constants/index.ts
+++ b/dictation_server/src/constants/index.ts
@@ -81,3 +81,9 @@ export const BLOB_STORAGE_REGION_EU = [
   'TR',
   'GB',
 ];
+
+/**
+ * ロールNone
+ * @const {string}
+ */
+export const ROLE_NONE = 'None';
diff --git a/dictation_server/src/features/accounts/accounts.controller.ts b/dictation_server/src/features/accounts/accounts.controller.ts
index 38e1133..4158e81 100644
--- a/dictation_server/src/features/accounts/accounts.controller.ts
+++ b/dictation_server/src/features/accounts/accounts.controller.ts
@@ -3,6 +3,7 @@ import { ApiOperation, ApiResponse, ApiTags } from '@nestjs/swagger';
 import { ErrorResponse } from '../../common/error/types/types';
 import { AccountsService } from './accounts.service';
 import { CreateAccountRequest, CreateAccountResponse } from './types/types';
+import { ROLE_NONE } from '../../constants';
 
 @ApiTags('accounts')
 @Controller('accounts')
@@ -38,7 +39,7 @@ export class AccountsController {
       adminName,
       acceptedTermsVersion,
     } = body;
-    const role = 'none';
+    const role = ROLE_NONE;
 
     await this.accountService.createAccount(
       companyName,