diff --git a/dictation_client/src/api/api.ts b/dictation_client/src/api/api.ts
index 6ceb8e6..2c44b9f 100644
--- a/dictation_client/src/api/api.ts
+++ b/dictation_client/src/api/api.ts
@@ -90,6 +90,12 @@ export interface Account {
      * @memberof Account
      */
     'secondryAdminUserId'?: number;
+    /**
+     * 
+     * @type {string}
+     * @memberof Account
+     */
+    'parentAccountName'?: string;
 }
 /**
  * 
diff --git a/dictation_client/src/pages/AccountPage/index.tsx b/dictation_client/src/pages/AccountPage/index.tsx
index 771a92e..402e044 100644
--- a/dictation_client/src/pages/AccountPage/index.tsx
+++ b/dictation_client/src/pages/AccountPage/index.tsx
@@ -124,7 +124,7 @@ const AccountPage: React.FC = (): JSX.Element => {
                   </dt>
                   <dd>{viewInfo.account.country}</dd>
                   <dt>{t(getTranslationID("accountPage.label.yourDealer"))}</dt>
-                  {isTier5 && !viewInfo.account.parentAccountId && (
+                  {isTier5 && !viewInfo.account.parentAccountName && (
                     <dd className={styles.form}>
                       <select
                         className={`${styles.formInput} ${styles.required}`}
@@ -154,12 +154,8 @@ const AccountPage: React.FC = (): JSX.Element => {
                       </select>
                     </dd>
                   )}
-                  {(!isTier5 || viewInfo.account.parentAccountId) && (
-                    <dd>
-                      {dealers.find(
-                        (x) => x.id === viewInfo.account.parentAccountId
-                      )?.name || "-"}
-                    </dd>
+                  {(!isTier5 || viewInfo.account.parentAccountName) && (
+                    <dd>{viewInfo.account.parentAccountName ?? "-"}</dd>
                   )}
                   <dt>
                     {t(getTranslationID("accountPage.label.dealerManagement"))}
diff --git a/dictation_server/src/api/odms/openapi.json b/dictation_server/src/api/odms/openapi.json
index 7f63f9e..52874b9 100644
--- a/dictation_server/src/api/odms/openapi.json
+++ b/dictation_server/src/api/odms/openapi.json
@@ -2975,7 +2975,8 @@
           "parentAccountId": { "type": "number" },
           "delegationPermission": { "type": "boolean" },
           "primaryAdminUserId": { "type": "number" },
-          "secondryAdminUserId": { "type": "number" }
+          "secondryAdminUserId": { "type": "number" },
+          "parentAccountName": { "type": "string" }
         },
         "required": [
           "accountId",
diff --git a/dictation_server/src/features/accounts/accounts.service.spec.ts b/dictation_server/src/features/accounts/accounts.service.spec.ts
index 6607a87..7fe4171 100644
--- a/dictation_server/src/features/accounts/accounts.service.spec.ts
+++ b/dictation_server/src/features/accounts/accounts.service.spec.ts
@@ -5166,9 +5166,12 @@ describe('getAccountInfo', () => {
   });
   it('パラメータのユーザに対応するアカウント情報を取得できる', async () => {
     const module = await makeTestingModule(source);
+    const { tier4Accounts: tier4Accounts } = await makeHierarchicalAccounts(
+      source,
+    );
     // 第五階層のアカウント作成
     const { account, admin } = await makeTestAccount(source, {
-      parent_account_id: 123,
+      parent_account_id: tier4Accounts[0].account.id,
     });
 
     const service = module.get<AccountsService>(AccountsService);
@@ -5195,6 +5198,9 @@ describe('getAccountInfo', () => {
       );
       expect(accountResponse.account.secondryAdminUserId).toBe(undefined);
       expect(accountResponse.account.tier).toBe(account.tier);
+      expect(accountResponse.account.parentAccountName).toBe(
+        tier4Accounts[0].account.company_name,
+      );
     }
   });
 });
diff --git a/dictation_server/src/features/accounts/accounts.service.ts b/dictation_server/src/features/accounts/accounts.service.ts
index 401bae4..2c13616 100644
--- a/dictation_server/src/features/accounts/accounts.service.ts
+++ b/dictation_server/src/features/accounts/accounts.service.ts
@@ -388,6 +388,13 @@ export class AccountsService {
         userInfo.account_id,
       );
 
+      let parentInfo: Account;
+      if (accountInfo.parent_account_id) {
+        parentInfo = await this.accountRepository.findAccountById(
+          accountInfo.parent_account_id,
+        );
+      }
+
       return {
         account: {
           accountId: userInfo.account_id,
@@ -398,6 +405,7 @@ export class AccountsService {
           delegationPermission: accountInfo.delegation_permission,
           primaryAdminUserId: accountInfo.primary_admin_user_id ?? undefined,
           secondryAdminUserId: accountInfo.secondary_admin_user_id ?? undefined,
+          parentAccountName: parentInfo ? parentInfo.company_name : undefined,
         },
       };
     } catch (e) {
diff --git a/dictation_server/src/features/accounts/types/types.ts b/dictation_server/src/features/accounts/types/types.ts
index f9675a0..16d2ed8 100644
--- a/dictation_server/src/features/accounts/types/types.ts
+++ b/dictation_server/src/features/accounts/types/types.ts
@@ -124,6 +124,9 @@ export class Account {
 
   @ApiProperty({ required: false })
   secondryAdminUserId?: number | undefined;
+
+  @ApiProperty({ required: false })
+  parentAccountName?: string | undefined;
 }
 
 export class GetMyAccountResponse {