diff --git a/AgileWorks/AgileWorks/Main/Wireframe/MainTabBarViewWireframe.swift b/AgileWorks/AgileWorks/Main/Wireframe/MainTabBarViewWireframe.swift
index a3895cc4a8a8edd1269bea84d94ab89da59a3309..0f3d9aa505ecff2c7fe4dc7693cd42825433975c 100644
--- a/AgileWorks/AgileWorks/Main/Wireframe/MainTabBarViewWireframe.swift
+++ b/AgileWorks/AgileWorks/Main/Wireframe/MainTabBarViewWireframe.swift
@@ -44,6 +44,7 @@ extension MainTabBarViewWireframeImpl: MainTabBarViewWireframe {
         }
         */
     }
+    // 通知から書類表示
     func showDocForm(notificationData: NotificationData) {
         let modalWebVC = WebViewBuilderImpl().buildVC()
         // URL , タイトル設定
@@ -52,6 +53,33 @@ extension MainTabBarViewWireframeImpl: MainTabBarViewWireframe {
         modalWebVC.showNotification = true
         let nav = UINavigationController(rootViewController: modalWebVC)
         nav.modalPresentationStyle = .fullScreen
-        self.viewController.present(nav, animated: true, completion: nil)
+        // 既にモーダルでViewが表示されているか。
+        if let presentNavi = self.viewController.presentedViewController as? UINavigationController {
+            // されている場合、開き直しの確認
+            showOverrideAlter(oldNavi: presentNavi, newNavi: nav)
+        } else {
+            // されていない場合、そのままモーダル表示
+            self.viewController.present(nav, animated: true, completion: nil)
+        }
+
+    }
+
+    // 書類上書き確認アラート表示
+    func showOverrideAlter(oldNavi: UINavigationController, newNavi: UINavigationController) {
+        // 開き直し確認
+        let message = localizadString(key: "DocOverrideConfirm", comment: "")
+        // OK アクション設定
+        let defaultAction = UIAlertAction(title: localizadString(key: "YES", comment: ""), style: .default) { _ in
+            // 今表示されている書類を閉じて、新たに開き直す
+            oldNavi.dismiss(animated: true, completion: nil)
+            self.viewController.present(newNavi, animated: true, completion: nil)
+        }
+        // キャンセルアクション設定
+        let cancelAction = UIAlertAction(title: localizadString(key: "NO", comment: ""), style: .cancel) { _ in
+            // 何もしない
+        }
+        // アラート表示
+        AppDelegate.shared.rootViewController.showAlertScreen(view: oldNavi, title: "", message: message, defaultAction: defaultAction, cancelAction: cancelAction)
     }
+
 }
diff --git a/AgileWorks/AgileWorks/Strings/Chinese-Simplified.strings b/AgileWorks/AgileWorks/Strings/Chinese-Simplified.strings
index aff780d68edbe42d925ab17308518297ee9fa934..e2be977fad72d9bf28b972f33d6a564cbc0f68ed 100644
--- a/AgileWorks/AgileWorks/Strings/Chinese-Simplified.strings
+++ b/AgileWorks/AgileWorks/Strings/Chinese-Simplified.strings
@@ -56,6 +56,9 @@
 // Open License
 "OpenLicenseViewTitle" = "开放许可证";
 
+// Notification
+"DocOverrideConfirm" = "既に通知タップによる書類が表示されています。\n現在の編集内容を破棄し、新たな書類を表示しますか。";
+
 // Approval
 "ApprovalTitle"      = "承認一覧";
 "ApprovalData"       = "%1$@ (%2$@)";
diff --git a/AgileWorks/AgileWorks/Strings/Chinese-Traditional.strings b/AgileWorks/AgileWorks/Strings/Chinese-Traditional.strings
index 58f58101b5ae86f8db52aa26a025ce87eb2e4140..1df73e119d7950f2aa9761dac65e39387ba8f20c 100644
--- a/AgileWorks/AgileWorks/Strings/Chinese-Traditional.strings
+++ b/AgileWorks/AgileWorks/Strings/Chinese-Traditional.strings
@@ -56,6 +56,9 @@
 // Open License
 "OpenLicenseViewTitle" = "開放許可證";
 
+// Notification
+"DocOverrideConfirm" = "既に通知タップによる書類が表示されています。\n現在の編集内容を破棄し、新たな書類を表示しますか。";
+
 // Approval
 "ApprovalTitle"      = "承認一覧";
 "ApprovalData"       = "%1$@ (%2$@)";
diff --git a/AgileWorks/AgileWorks/Strings/English.strings b/AgileWorks/AgileWorks/Strings/English.strings
index 5d6317b6932ee6cc4176c02fc74cf65e1ce0ce3f..8abfea64a3bed356bd2540cd572daf148cff46db 100644
--- a/AgileWorks/AgileWorks/Strings/English.strings
+++ b/AgileWorks/AgileWorks/Strings/English.strings
@@ -56,6 +56,9 @@
 // Open License
 "OpenLicenseViewTitle" = "Open license";
 
+// Notification
+"DocOverrideConfirm" = "既に通知タップによる書類が表示されています。\n現在の編集内容を破棄し、新たな書類を表示しますか。";
+
 // Approval
 "ApprovalTitle"      = "承認一覧";
 "ApprovalData"       = "%1$@ (%2$@)";
diff --git a/AgileWorks/AgileWorks/Strings/Japanese.strings b/AgileWorks/AgileWorks/Strings/Japanese.strings
index 8c8c1d070f2540f16ca1189c198922b844ac42f2..61db03287667841b7ec61819208acbb909b8a89e 100644
--- a/AgileWorks/AgileWorks/Strings/Japanese.strings
+++ b/AgileWorks/AgileWorks/Strings/Japanese.strings
@@ -56,6 +56,9 @@
 // Open License
 "OpenLicenseViewTitle" = "オープンソースライセンス";
 
+// Notification
+"DocOverrideConfirm" = "既に通知タップによる書類が表示されています。\n現在の編集内容を破棄し、新たな書類を表示しますか。";
+
 // Approval
 "ApprovalTitle"      = "承認一覧";
 "ApprovalData"       = "%1$@ (%2$@)";
diff --git a/AgileWorks/AgileWorks/Strings/en.lproj/Localizable.strings b/AgileWorks/AgileWorks/Strings/en.lproj/Localizable.strings
index 0fb1fd3bf9a1b5dd9ac89a2f9b42d032712a7229..c185633e162097ec80c848cb0b454e5a1bcca749 100644
--- a/AgileWorks/AgileWorks/Strings/en.lproj/Localizable.strings
+++ b/AgileWorks/AgileWorks/Strings/en.lproj/Localizable.strings
@@ -56,6 +56,9 @@
 // Open License
 "OpenLicenseViewTitle" = "Open license";
 
+// Notification
+"DocOverrideConfirm" = "既に通知タップによる書類が表示されています。\n現在の編集内容を破棄し、新たな書類を表示しますか。";
+
 // Approval
 "ApprovalTitle"      = "承認一覧";
 "ApprovalData"       = "%1$@ (%2$@)";
diff --git a/AgileWorks/AgileWorks/Strings/ja.lproj/Localizable.strings b/AgileWorks/AgileWorks/Strings/ja.lproj/Localizable.strings
index aaea5220bdd3cb457af23e665b25e6ee136cfed8..aa151b703883606b0cb02dd65595390c6ddf8a44 100644
--- a/AgileWorks/AgileWorks/Strings/ja.lproj/Localizable.strings
+++ b/AgileWorks/AgileWorks/Strings/ja.lproj/Localizable.strings
@@ -56,6 +56,9 @@
 // Open License
 "OpenLicenseViewTitle" = "オープンソースライセンス";
 
+// Notification
+"DocOverrideConfirm" = "既に通知タップによる書類が表示されています。\n現在の編集内容を破棄し、新たな書類を表示しますか。";
+
 // Approval
 "ApprovalTitle"      = "承認一覧";
 "ApprovalData"       = "%1$@ (%2$@)";
diff --git a/AgileWorks/AgileWorks/Strings/zh-Hans.lproj/Localizable.strings b/AgileWorks/AgileWorks/Strings/zh-Hans.lproj/Localizable.strings
index 85862b004dc03466be9edc146d5151429a540532..463d57a9055fbb26a899a3ba0705b3faf2b47cc0 100644
--- a/AgileWorks/AgileWorks/Strings/zh-Hans.lproj/Localizable.strings
+++ b/AgileWorks/AgileWorks/Strings/zh-Hans.lproj/Localizable.strings
@@ -56,6 +56,9 @@
 // Open License
 "OpenLicenseViewTitle" = "开放许可证";
 
+// Notification
+"DocOverrideConfirm" = "既に通知タップによる書類が表示されています。\n現在の編集内容を破棄し、新たな書類を表示しますか。";
+
 // Approval
 "ApprovalTitle"      = "承認一覧";
 "ApprovalData"       = "%1$@ (%2$@)";
diff --git a/AgileWorks/AgileWorks/Strings/zh-Hant.lproj/Localizable.strings b/AgileWorks/AgileWorks/Strings/zh-Hant.lproj/Localizable.strings
index 4613b550a162950985aae413192bc4650521e85e..3abe001c8d5ac7492d2ac4b557bde450501298c7 100644
--- a/AgileWorks/AgileWorks/Strings/zh-Hant.lproj/Localizable.strings
+++ b/AgileWorks/AgileWorks/Strings/zh-Hant.lproj/Localizable.strings
@@ -56,6 +56,9 @@
 // Open License
 "OpenLicenseViewTitle" = "開放許可證";
 
+// Notification
+"DocOverrideConfirm" = "既に通知タップによる書類が表示されています。\n現在の編集内容を破棄し、新たな書類を表示しますか。";
+
 // Approval
 "ApprovalTitle"      = "承認一覧";
 "ApprovalData"       = "%1$@ (%2$@)";