diff --git a/AgileWorks/AgileWorks/Login/View/LoginViewController.swift b/AgileWorks/AgileWorks/Login/View/LoginViewController.swift
index c321e43ddd463c55c3837c5412863e7b6a90fcb4..41d1217fd55fd10493612736ea24565720f9fba9 100644
--- a/AgileWorks/AgileWorks/Login/View/LoginViewController.swift
+++ b/AgileWorks/AgileWorks/Login/View/LoginViewController.swift
@@ -10,6 +10,7 @@ import AuthenticationServices
 import AVFoundation
 import DropDown
 import UIKit
+import WidgetKit
 
 protocol LoginView: AnyObject {
 }
@@ -58,6 +59,18 @@ class LoginViewController: UIViewController {
     override func viewDidLoad() {
         super.viewDidLoad()
 
+        //認証情報削除
+        KeychainDataStore().removeOAuthState()
+        KeychainDataStore().removeAccessToken()
+        KeychainDataStore().removeSessionID()
+        KeychainDataStore().removeLanguage()
+        KeychainDataStore().removeDeviceID()
+        
+        //ウィジェットの更新
+        if #available(iOS 14.0, *) {
+            WidgetCenter.shared.reloadAllTimelines()
+        }
+
         clientCertificateSettingView.isHidden = (CertificateDataStore().readClientCertificate() == nil)
         //固定文言表示
         setupFixedWording()