diff --git a/AgileWorks/AgileWorks/WebView/View/WebViewController.swift b/AgileWorks/AgileWorks/WebView/View/WebViewController.swift
index 1fced293d6ac3239eb2df2ebf977b1dcc1e6dbcc..5be3f716372983cd204baf9bbe9701fbffd37544 100644
--- a/AgileWorks/AgileWorks/WebView/View/WebViewController.swift
+++ b/AgileWorks/AgileWorks/WebView/View/WebViewController.swift
@@ -48,7 +48,7 @@ class WebViewController: UIViewController {
 
     override func viewDidLoad() {
         super.viewDidLoad()
-        
+
         //webviewの生成
         self.setWebView()
 
@@ -80,12 +80,12 @@ class WebViewController: UIViewController {
         pinch.delegate = self
         self.view.addGestureRecognizer(pinch)
     }
-    
+
     //書類表示時のピンチイン・アウト処理
     @objc func pinchHandler(_ gesture: UIPinchGestureRecognizer) {
         //拡大・縮小比率
         let pinchRatio = 0.2
-        
+
        // 拡大
        if pinchLevel + pinchRatio <= gesture.scale {
            pinchLevel += pinchRatio
@@ -316,7 +316,7 @@ class WebViewController: UIViewController {
             if let url = change![NSKeyValueChangeKey.newKey] as? URL {
                 let urlString: String = url.absoluteString
                 self.nowURL = urlString
-                
+
                 if urlString != loadURL {
                     mainWebView.allowsBackForwardNavigationGestures = true
                 }
@@ -412,7 +412,7 @@ class WebViewController: UIViewController {
         if viewReload {
             //履歴をリセットする
             mainWebView.allowsBackForwardNavigationGestures = false
-            
+
             if mainWebView.canGoBack {
                 if mainWebView.backForwardList.backList.first!.url.absoluteString != self.loadURL {
                     setWebView()
@@ -463,11 +463,11 @@ extension WebViewController: WKUIDelegate {
             subWebView.navigationDelegate = self
             subViewStack.push(subWebView, superView: mainWebView)
             subWebView.load(navigationAction.request)
-            
+
             //キャンセルボタンの表示
             self.closeButton.title = getDisplayString(key: "Close", comment: "")
             self.closeButton.isEnabled = true
-            
+
             return subWebView
         }
         return nil
@@ -496,10 +496,14 @@ extension WebViewController: WKNavigationDelegate {
         }
 
         private func attachmentFileName(ofResponce navigationResponse: WKNavigationResponse) -> String? {
-            guard let response = navigationResponse.response as? HTTPURLResponse,
-                let contentDisposition = response.allHeaderFields["Content-Disposition"] as? String
+            guard let response = navigationResponse.response as? HTTPURLResponse
+                else { return nil }
+            return attachmentFileName(response)
+        }
+
+        private func attachmentFileName(_ response: HTTPURLResponse) -> String? {
+            guard let contentDisposition = response.allHeaderFields["Content-Disposition"] as? String
                 else { return nil }
-            print(response.allHeaderFields)
             if let (fileNameStar: fileNameStar, fileName: fileName) = getAttachmentFileName(contentDisposition: contentDisposition) {
                 if let name = fileNameStar, let decoded = parseFilenameStar(name) {
                     return decoded
@@ -579,21 +583,62 @@ extension WebViewController: WKNavigationDelegate {
 
         private func download(url: URL, saveAs fileName: String) {
             var request = downloadRequest(url: url)
-            let tempPath: URL = FileManager.default.temporaryDirectory.appendingPathComponent(fileName)
-            Session.shared.dataTask(with: request) { data, _, err in
+            var tempPath: URL = FileManager.default.temporaryDirectory.appendingPathComponent(fileName)
+            Session.shared.dataTask(with: request) { data, res, err in
                 guard let data = data, err == nil else {
                     log.e(err)
                     return
                 }
 
                 do {
+                    let response = res as? HTTPURLResponse
+                    var fileName: String?
+                    if response != nil {
+                        fileName = self.attachmentFileName(response!)
+                    }
+
+                    if fileName != nil {
+                        tempPath = FileManager.default.temporaryDirectory.appendingPathComponent(fileName!.removingPercentEncoding!)
+                    }
+
                     try data.write(to: tempPath, options: .atomic)
                 } catch {
                     log.e(error)
                     return
                 }
                 DispatchQueue.main.async {[self] in
-                    self.subWebView.loadFileURL(tempPath, allowingReadAccessTo: tempPath)
+                    let activityViewController = UIActivityViewController(activityItems: [tempPath], applicationActivities: nil)
+                    activityViewController.completionWithItemsHandler = { (activityType: UIActivity.ActivityType?, completed: Bool, returnedItems: [Any]?, activityError: Error?) in
+                        self.closeTapped()
+
+                        guard completed else {
+                            return
+                        }
+                        var url = URL(string: "")
+                        //ActivityTypeで動作を分ける場合は以下に追加
+                        switch activityType {
+                        case UIActivity.ActivityType.saveToCameraRoll:
+                            url = URL(string: "photos-redirect://")
+                        case UIActivity.ActivityType(rawValue: "com.apple.CloudDocsUI.AddToiCloudDrive"):
+                            url = URL(string: "shareddocuments://")
+                        case UIActivity.ActivityType(rawValue: "com.apple.DocumentManagerUICore.SaveToFiles"):
+                            url = URL(string: "shareddocuments://")
+                        default:
+                            break
+                        }
+
+                        //該当するアプリを開く
+                        if url != nil {
+                            UIApplication.shared.open(url!)
+                        }
+
+                        do {
+                            try FileManager.default.removeItem(at: tempPath)
+                        } catch {
+                            log.e(error)
+                        }
+                    }
+                    self.present(activityViewController, animated: true, completion: nil)
                 }
             }.resume()
         }