diff --git a/AgileWorks/AgileWorks/Main/View/MainTabBarViewController.swift b/AgileWorks/AgileWorks/Main/View/MainTabBarViewController.swift
index ba8feeef509ae33bf4408da63e02012b694aad6e..d0649ecae8d6b726516cddb4120f84ea67b4ac1f 100644
--- a/AgileWorks/AgileWorks/Main/View/MainTabBarViewController.swift
+++ b/AgileWorks/AgileWorks/Main/View/MainTabBarViewController.swift
@@ -34,6 +34,7 @@ class MainTabBarViewController: UITabBarController {
         super.viewDidLoad()
         delegate = self
         NotificationCenter.default.addObserver(self, selector: #selector(updateFcmToken(notification:)), name: .notifyFCMToken, object: nil)
+        NotificationCenter.default.addObserver(self, selector: #selector(movedToBackground), name: UIApplication.willResignActiveNotification, object: nil)
     }
 
     @objc
@@ -47,6 +48,33 @@ class MainTabBarViewController: UITabBarController {
             }
         }
     }
+    
+    @objc
+    func movedToBackground() {
+        // 承認待ち件数の取得
+        getApprovals { result in
+            var reqApprovalCount = 0
+            switch result {
+            case .success(let response):
+                let requestApproval = "REQUEST_APPROVAL"
+                for item in response.items where item.code == requestApproval {
+                    reqApprovalCount = item.count
+                }
+                DispatchQueue.main.async {
+                    UIApplication.shared.applicationIconBadgeNumber = reqApprovalCount
+                }
+            case .failure(let error):
+                log.e(error)
+            }
+        }
+    }
+    // 承認件数取得
+    private func getApprovals(completion: @escaping (Result<ApprovalResponse, SessionError>) -> Void) {
+        let approvalsEndpoint = GetApprovalsEndpoint()
+        Session.send(approvalsEndpoint) { result in
+            completion(result)
+        }
+    }
 
     func popViewController() {
         guard let navigation = self.viewControllers?[self.selectedIndex] as? UINavigationController else {