diff --git a/dictation_server/src/common/error/code.ts b/dictation_server/src/common/error/code.ts
index 09d67f4..f6b6ff7 100644
--- a/dictation_server/src/common/error/code.ts
+++ b/dictation_server/src/common/error/code.ts
@@ -54,4 +54,5 @@ export const ErrorCodes = [
   'E010908', // タイピストグループ不在エラー
   'E011001', // ワークタイプ重複エラー
   'E011002', // ワークタイプ登録上限超過エラー
+  'E011003', // ワークタイプ不在エラー
 ] as const;
diff --git a/dictation_server/src/common/error/message.ts b/dictation_server/src/common/error/message.ts
index 7515d95..acd2efd 100644
--- a/dictation_server/src/common/error/message.ts
+++ b/dictation_server/src/common/error/message.ts
@@ -43,4 +43,5 @@ export const errors: Errors = {
   E010908: 'Typist Group not exist Error',
   E011001: 'Thiw WorkTypeID already used Error',
   E011002: 'WorkTypeID create limit exceeded Error',
+  E011003: 'WorkTypeID not found Error',
 };
diff --git a/dictation_server/src/features/accounts/accounts.controller.ts b/dictation_server/src/features/accounts/accounts.controller.ts
index 9753144..93abc48 100644
--- a/dictation_server/src/features/accounts/accounts.controller.ts
+++ b/dictation_server/src/features/accounts/accounts.controller.ts
@@ -759,10 +759,13 @@ export class AccountsController {
 
     const context = makeContext(userId);
 
-    console.log('worktypeId: ', worktypeId);
-    console.log('description: ', description);
-    console.log('id: ', id);
-    console.log(context.trackingId);
+    await this.accountService.updateWorktype(
+      context,
+      userId,
+      id,
+      worktypeId,
+      description,
+    );
 
     return {};
   }
diff --git a/dictation_server/src/features/accounts/accounts.service.spec.ts b/dictation_server/src/features/accounts/accounts.service.spec.ts
index b8ab69c..618abf9 100644
--- a/dictation_server/src/features/accounts/accounts.service.spec.ts
+++ b/dictation_server/src/features/accounts/accounts.service.spec.ts
@@ -61,6 +61,7 @@ import {
   selectOrderLicense,
 } from '../licenses/test/utility';
 import { WorktypesRepositoryService } from '../../repositories/worktypes/worktypes.repository.service';
+import { Worktype } from '../../repositories/worktypes/entity/worktype.entity';
 
 describe('createAccount', () => {
   let source: DataSource = null;
@@ -3591,6 +3592,275 @@ describe('createWorktype', () => {
     }
   });
 });
+
+describe('updateWorktype', () => {
+  let source: DataSource = null;
+  beforeEach(async () => {
+    source = new DataSource({
+      type: 'sqlite',
+      database: ':memory:',
+      logging: false,
+      entities: [__dirname + '/../../**/*.entity{.ts,.js}'],
+      synchronize: true, // trueにすると自動的にmigrationが行われるため注意
+    });
+    return source.initialize();
+  });
+
+  afterEach(async () => {
+    await source.destroy();
+    source = null;
+  });
+
+  it('Worktypeを更新できる', async () => {
+    const module = await makeTestingModule(source);
+    // 第五階層のアカウント作成
+    const { account, admin } = await makeTestAccount(source, { tier: 5 });
+
+    const service = module.get<AccountsService>(AccountsService);
+    const context = makeContext(admin.external_id);
+
+    const worktype = new Worktype();
+    worktype.custom_worktype_id = 'worktypeID1';
+    worktype.description = 'description1';
+
+    await createWorktype(
+      source,
+      account.id,
+      worktype.custom_worktype_id,
+      worktype.description,
+    );
+
+    // Worktypeを確認
+    const worktypes = await getWorktypes(source, account.id);
+    {
+      expect(worktypes.length).toBe(1);
+      expect(worktypes[0].custom_worktype_id).toBe(worktype.custom_worktype_id);
+      expect(worktypes[0].description).toBe(worktype.description);
+    }
+
+    const updateWorktypeId = 'updateWorktypeID';
+    const updateDescription = 'updateDescription';
+
+    await service.updateWorktype(
+      context,
+      admin.external_id,
+      worktypes[0].id,
+      updateWorktypeId,
+      updateDescription,
+    );
+
+    //実行結果を確認
+    {
+      const worktypes = await getWorktypes(source, account.id);
+      expect(worktypes.length).toBe(1);
+      expect(worktypes[0].custom_worktype_id).toBe(updateWorktypeId);
+      expect(worktypes[0].description).toBe(updateDescription);
+    }
+  });
+
+  it('指定したIDが登録されていない場合、400エラーとなること', async () => {
+    const module = await makeTestingModule(source);
+    // 第五階層のアカウント作成
+    const { account, admin } = await makeTestAccount(source, { tier: 5 });
+
+    const service = module.get<AccountsService>(AccountsService);
+    const context = makeContext(admin.external_id);
+
+    const worktype = new Worktype();
+    worktype.custom_worktype_id = 'worktypeID1';
+    worktype.description = 'description1';
+
+    await createWorktype(
+      source,
+      account.id,
+      worktype.custom_worktype_id,
+      worktype.description,
+    );
+
+    // Worktypeを確認
+    {
+      const worktypes = await getWorktypes(source, account.id);
+      expect(worktypes.length).toBe(1);
+      expect(worktypes[0].custom_worktype_id).toBe(worktype.custom_worktype_id);
+      expect(worktypes[0].description).toBe(worktype.description);
+    }
+
+    try {
+      await service.updateWorktype(
+        context,
+        admin.external_id,
+        999,
+        'newWorktypeID',
+        'newDescription',
+      );
+    } catch (e) {
+      if (e instanceof HttpException) {
+        expect(e.getStatus()).toEqual(HttpStatus.BAD_REQUEST);
+        expect(e.getResponse()).toEqual(makeErrorResponse('E011003'));
+      } else {
+        fail();
+      }
+    }
+  });
+
+  it('WorktypeIDが登録済みのWorktypeIDと重複した場合、400エラーとなること', async () => {
+    const module = await makeTestingModule(source);
+    // 第五階層のアカウント作成
+    const { account, admin } = await makeTestAccount(source, { tier: 5 });
+
+    const service = module.get<AccountsService>(AccountsService);
+    const context = makeContext(admin.external_id);
+    const worktype1 = new Worktype();
+    worktype1.custom_worktype_id = 'worktypeID1';
+    worktype1.description = 'description1';
+
+    const worktype2 = new Worktype();
+    worktype2.custom_worktype_id = 'worktypeID2';
+    worktype2.description = 'description2';
+
+    await createWorktype(
+      source,
+      account.id,
+      worktype1.custom_worktype_id,
+      worktype1.description,
+    );
+    await createWorktype(
+      source,
+      account.id,
+      worktype2.custom_worktype_id,
+      worktype2.description,
+    );
+
+    //作成したデータを確認
+    const worktypes = await getWorktypes(source, account.id);
+    {
+      expect(worktypes.length).toBe(2);
+      expect(worktypes[0].custom_worktype_id).toBe(
+        worktype1.custom_worktype_id,
+      );
+      expect(worktypes[0].description).toBe(worktype1.description);
+      expect(worktypes[1].custom_worktype_id).toBe(
+        worktype2.custom_worktype_id,
+      );
+      expect(worktypes[1].description).toBe(worktype2.description);
+    }
+
+    try {
+      await service.updateWorktype(
+        context,
+        admin.external_id,
+        worktypes[0].id,
+        worktype2.custom_worktype_id,
+        worktype2.description,
+      );
+    } catch (e) {
+      if (e instanceof HttpException) {
+        expect(e.getStatus()).toEqual(HttpStatus.BAD_REQUEST);
+        expect(e.getResponse()).toEqual(makeErrorResponse('E011001'));
+      } else {
+        fail();
+      }
+    }
+  });
+
+  it('WorktypeIDが登録済みの指定IDのWorktypeIDと重複した場合でも更新できること', async () => {
+    const module = await makeTestingModule(source);
+    // 第五階層のアカウント作成
+    const { account, admin } = await makeTestAccount(source, { tier: 5 });
+
+    const service = module.get<AccountsService>(AccountsService);
+    const context = makeContext(admin.external_id);
+
+    const worktype = new Worktype();
+    worktype.custom_worktype_id = 'worktypeID1';
+    worktype.description = 'description1';
+
+    await createWorktype(
+      source,
+      account.id,
+      worktype.custom_worktype_id,
+      worktype.description,
+    );
+
+    // Worktypeを確認
+    const worktypes = await getWorktypes(source, account.id);
+    {
+      expect(worktypes.length).toBe(1);
+      expect(worktypes[0].custom_worktype_id).toBe(worktype.custom_worktype_id);
+      expect(worktypes[0].description).toBe(worktype.description);
+    }
+
+    const updateDescription = 'updateDescription';
+
+    await service.updateWorktype(
+      context,
+      admin.external_id,
+      worktypes[0].id,
+      worktype.custom_worktype_id,
+      updateDescription,
+    );
+
+    //実行結果を確認
+    {
+      const worktypes = await getWorktypes(source, account.id);
+      expect(worktypes.length).toBe(1);
+      expect(worktypes[0].custom_worktype_id).toBe(worktype.custom_worktype_id);
+      expect(worktypes[0].description).toBe(updateDescription);
+    }
+  });
+
+  it('DBアクセスに失敗した場合、500エラーを返却する', async () => {
+    const module = await makeTestingModule(source);
+    // 第五階層のアカウント作成
+    const { account, admin } = await makeTestAccount(source, { tier: 5 });
+
+    const service = module.get<AccountsService>(AccountsService);
+    const context = makeContext(admin.external_id);
+
+    const worktype = new Worktype();
+    worktype.custom_worktype_id = 'worktypeID1';
+    worktype.description = 'description1';
+
+    await createWorktype(
+      source,
+      account.id,
+      worktype.custom_worktype_id,
+      worktype.description,
+    );
+
+    // Worktypeを確認
+    const worktypes = await getWorktypes(source, account.id);
+    {
+      expect(worktypes.length).toBe(1);
+      expect(worktypes[0].custom_worktype_id).toBe(worktype.custom_worktype_id);
+      expect(worktypes[0].description).toBe(worktype.description);
+    }
+
+    //DBアクセスに失敗するようにする
+    const worktypeService = module.get<WorktypesRepositoryService>(
+      WorktypesRepositoryService,
+    );
+    worktypeService.updateWorktype = jest.fn().mockRejectedValue('DB failed');
+
+    try {
+      await service.updateWorktype(
+        context,
+        admin.external_id,
+        worktypes[0].id,
+        'newWorktype',
+        'newDescription',
+      );
+    } catch (e) {
+      if (e instanceof HttpException) {
+        expect(e.getStatus()).toEqual(HttpStatus.INTERNAL_SERVER_ERROR);
+        expect(e.getResponse()).toEqual(makeErrorResponse('E009999'));
+      } else {
+        fail();
+      }
+    }
+  });
+});
+
 describe('ライセンス発行キャンセル', () => {
   let source: DataSource = null;
   beforeEach(async () => {
diff --git a/dictation_server/src/features/accounts/accounts.service.ts b/dictation_server/src/features/accounts/accounts.service.ts
index 1c9e1ca..bdfb545 100644
--- a/dictation_server/src/features/accounts/accounts.service.ts
+++ b/dictation_server/src/features/accounts/accounts.service.ts
@@ -53,6 +53,7 @@ import { WorktypesRepositoryService } from '../../repositories/worktypes/worktyp
 import {
   WorktypeIdAlreadyExistsError,
   WorktypeIdMaxCountError,
+  WorktypeIdNotFoundError,
 } from '../../repositories/worktypes/errors/types';
 
 @Injectable()
@@ -1241,4 +1242,74 @@ export class AccountsService {
       );
     }
   }
+
+  /**
+   * ワークタイプを更新します
+   * @param context
+   * @param externalId
+   * @param id ワークタイプの内部ID
+   * @param worktypeId ユーザーが設定するワークタイプ名
+   * @param [description]
+   * @returns worktype
+   */
+  async updateWorktype(
+    context: Context,
+    externalId: string,
+    id: number,
+    worktypeId: string,
+    description?: string,
+  ): Promise<void> {
+    this.logger.log(
+      `[IN] [${context.trackingId}] ${this.updateWorktype.name} | params: { ` +
+        `externalId: ${externalId}, ` +
+        `id: ${id}, ` +
+        `worktypeId: ${worktypeId}, ` +
+        `description: ${description} };`,
+    );
+
+    try {
+      // 外部IDをもとにユーザー情報を取得する
+      const { account_id: accountId } =
+        await this.usersRepository.findUserByExternalId(externalId);
+
+      // ワークタイプを更新する
+      await this.worktypesRepository.updateWorktype(
+        accountId,
+        id,
+        worktypeId,
+        description,
+      );
+    } catch (e) {
+      this.logger.error(`error=${e}`);
+      if (e instanceof Error) {
+        switch (e.constructor) {
+          // ユーザーが設定したWorktypeIDが既存WorktypeのWorktypeIDと重複する場合は400エラーを返す
+          case WorktypeIdAlreadyExistsError:
+            throw new HttpException(
+              makeErrorResponse('E011001'),
+              HttpStatus.BAD_REQUEST,
+            );
+          // 内部IDで指定されたWorktypeが存在しない場合は400エラーを返す
+          case WorktypeIdNotFoundError:
+            throw new HttpException(
+              makeErrorResponse('E011003'),
+              HttpStatus.BAD_REQUEST,
+            );
+          default:
+            throw new HttpException(
+              makeErrorResponse('E009999'),
+              HttpStatus.INTERNAL_SERVER_ERROR,
+            );
+        }
+      }
+      throw new HttpException(
+        makeErrorResponse('E009999'),
+        HttpStatus.INTERNAL_SERVER_ERROR,
+      );
+    } finally {
+      this.logger.log(
+        `[OUT] [${context.trackingId}] ${this.updateWorktype.name}`,
+      );
+    }
+  }
 }
diff --git a/dictation_server/src/repositories/worktypes/errors/types.ts b/dictation_server/src/repositories/worktypes/errors/types.ts
index eefc9e0..af772a1 100644
--- a/dictation_server/src/repositories/worktypes/errors/types.ts
+++ b/dictation_server/src/repositories/worktypes/errors/types.ts
@@ -2,3 +2,5 @@
 export class WorktypeIdAlreadyExistsError extends Error {}
 // WorktypeID登録上限エラー
 export class WorktypeIdMaxCountError extends Error {}
+// WorktypeID不在エラー
+export class WorktypeIdNotFoundError extends Error {}
diff --git a/dictation_server/src/repositories/worktypes/worktypes.repository.service.ts b/dictation_server/src/repositories/worktypes/worktypes.repository.service.ts
index d8ca2cc..2f3920c 100644
--- a/dictation_server/src/repositories/worktypes/worktypes.repository.service.ts
+++ b/dictation_server/src/repositories/worktypes/worktypes.repository.service.ts
@@ -1,5 +1,5 @@
 import { Injectable } from '@nestjs/common';
-import { DataSource } from 'typeorm';
+import { DataSource, Not } from 'typeorm';
 import { Worktype } from './entity/worktype.entity';
 import {
   OPTION_ITEM_NUM,
@@ -9,6 +9,7 @@ import {
 import {
   WorktypeIdAlreadyExistsError,
   WorktypeIdMaxCountError,
+  WorktypeIdNotFoundError,
 } from './errors/types';
 import { OptionItem } from '../option_items/entity/option_item.entity';
 
@@ -34,14 +35,13 @@ export class WorktypesRepositoryService {
    * @param accountId
    * @param worktypeId
    * @param [description]
-   * @returns worktype
    */
   async createWorktype(
     accountId: number,
     worktypeId: string,
     description?: string,
-  ): Promise<Worktype> {
-    return await this.dataSource.transaction(async (entityManager) => {
+  ): Promise<void> {
+    await this.dataSource.transaction(async (entityManager) => {
       const worktypeRepo = entityManager.getRepository(Worktype);
       const optionItemRepo = entityManager.getRepository(OptionItem);
 
@@ -86,8 +86,53 @@ export class WorktypesRepositoryService {
       });
 
       await optionItemRepo.save(newOptionItems);
+    });
+  }
 
-      return worktype;
+  /**
+   * ワークタイプを更新する
+   * @param accountId
+   * @param id ワークタイプの内部ID
+   * @param worktypeId ユーザーが設定するワークタイプ名
+   * @param [description]
+   */
+  async updateWorktype(
+    accountId: number,
+    id: number,
+    worktypeId: string,
+    description?: string,
+  ): Promise<void> {
+    await this.dataSource.transaction(async (entityManager) => {
+      const worktypeRepo = entityManager.getRepository(Worktype);
+
+      const worktype = await worktypeRepo.findOne({
+        where: { account_id: accountId, id: id },
+      });
+
+      // ワークタイプが存在しない場合はエラー
+      if (!worktype) {
+        throw new WorktypeIdNotFoundError(`Worktype is not found. id: ${id}`);
+      }
+
+      const duplicatedWorktype = await worktypeRepo.findOne({
+        where: {
+          account_id: accountId,
+          custom_worktype_id: worktypeId,
+          id: Not(id),
+        },
+      });
+
+      // ワークタイプIDが重複している場合はエラー
+      if (duplicatedWorktype) {
+        throw new WorktypeIdAlreadyExistsError(
+          `WorktypeID is already exists. WorktypeID: ${worktypeId}`,
+        );
+      }
+
+      // ワークタイプを更新
+      worktype.custom_worktype_id = worktypeId;
+      worktype.description = description;
+      await worktypeRepo.save(worktype);
     });
   }
 }