diff --git a/Weekand/Weekand/Domain/UseCase/Sign/SignInUseCase.swift b/Weekand/Weekand/Domain/UseCase/Sign/SignInUseCase.swift
index 90ac5d23..dbf119fc 100644
--- a/Weekand/Weekand/Domain/UseCase/Sign/SignInUseCase.swift
+++ b/Weekand/Weekand/Domain/UseCase/Sign/SignInUseCase.swift
@@ -29,4 +29,16 @@ final class SignInUseCase {
             }
             .asSingle()
     }
+    
+    func userID() -> Single<String> {
+        return NetWork.shared.fetch(query: UserSummaryQuery())
+            .map {
+                if let user = $0.user {
+                    return user.id
+                } else {
+                    return UserSummary.defaultData.name
+                }
+            }
+            .asSingle()
+    }
 }
diff --git a/Weekand/Weekand/Presentation/SignScene/SignIn/ViewModel/SignInViewModel.swift b/Weekand/Weekand/Presentation/SignScene/SignIn/ViewModel/SignInViewModel.swift
index 363cff10..679754ca 100644
--- a/Weekand/Weekand/Presentation/SignScene/SignIn/ViewModel/SignInViewModel.swift
+++ b/Weekand/Weekand/Presentation/SignScene/SignIn/ViewModel/SignInViewModel.swift
@@ -75,6 +75,16 @@ extension SignInViewModel {
         
         self.signInUseCase.login(email: emailText, password: passwordText).subscribe(onSuccess: { tokenData in
             UserDataStorage.shared.setAccessToken(token: tokenData.accessToken)
+            self.userID()
+        }, onFailure: { _ in
+            self.coordinator?.showToastMessage()
+        }, onDisposed: nil)
+        .disposed(by: disposeBag)
+    }
+    
+    private func userID() {
+        self.signInUseCase.userID().subscribe(onSuccess: { id in
+            UserDataStorage.shared.setUserID(id: id)
             self.coordinator?.showMainScene()
         }, onFailure: { _ in
             self.coordinator?.showToastMessage()