diff --git a/dictation_server/src/gateways/adb2c/adb2c.service.ts b/dictation_server/src/gateways/adb2c/adb2c.service.ts
index 1704f44..7d8c17b 100644
--- a/dictation_server/src/gateways/adb2c/adb2c.service.ts
+++ b/dictation_server/src/gateways/adb2c/adb2c.service.ts
@@ -233,6 +233,26 @@ export class AdB2cService {
       this.logger.log(`[OUT] [${context.trackingId}] ${this.getUsers.name}`);
     }
   }
+  /**
+   * Azure AD B2Cからユーザ情報を削除する
+   * @param externalId 外部ユーザーID
+   * @param context コンテキスト
+   */
+  async deleteUser(externalId: string, context: Context): Promise<void> {
+    this.logger.log(
+      `[IN] [${context.trackingId}] ${this.deleteUser.name} | params: { externalId: ${externalId} };`,
+    );
+
+    try {
+      // https://learn.microsoft.com/en-us/graph/api/user-delete?view=graph-rest-1.0&tabs=javascript#example
+      await this.graphClient.api(`users/${externalId}`).delete();
+    } catch (e) {
+      this.logger.error(`error=${e}`);
+      throw e;
+    } finally {
+      this.logger.log(`[OUT] [${context.trackingId}] ${this.deleteUser.name}`);
+    }
+  }
 }
 
 // TODO [Task2002] 文字列の配列を１５要素ずつ区切る（この処理も別タスクで削除予定）