diff --git a/AgileWorks/AgileWorks/WebView/View/WebViewController.storyboard b/AgileWorks/AgileWorks/WebView/View/WebViewController.storyboard
index bca840b46d55ad67828b83b8a9d527a9e2d97d55..19d9eca851f2e4f6f01c77bb8f1c1bc7dcf3a9be 100644
--- a/AgileWorks/AgileWorks/WebView/View/WebViewController.storyboard
+++ b/AgileWorks/AgileWorks/WebView/View/WebViewController.storyboard
@@ -22,6 +22,7 @@
                             <view contentMode="scaleToFill" translatesAutoresizingMaskIntoConstraints="NO" id="45R-16-zHE" userLabel="Form View">
                                 <rect key="frame" x="0.0" y="88" width="414" height="774"/>
                                 <color key="backgroundColor" systemColor="systemBackgroundColor"/>
+                                <gestureRecognizers/>
                             </view>
                             <view hidden="YES" contentMode="scaleToFill" translatesAutoresizingMaskIntoConstraints="NO" id="SDl-Pj-V4V" userLabel="Disabling View">
                                 <rect key="frame" x="0.0" y="88" width="414" height="774"/>
diff --git a/AgileWorks/AgileWorks/WebView/View/WebViewController.swift b/AgileWorks/AgileWorks/WebView/View/WebViewController.swift
index 995b398286d92d5f761d9c1e66e36b7072bd19ad..676bc2f490a47b7a286fc2b78e247419c8420a7b 100644
--- a/AgileWorks/AgileWorks/WebView/View/WebViewController.swift
+++ b/AgileWorks/AgileWorks/WebView/View/WebViewController.swift
@@ -42,6 +42,9 @@ class WebViewController: UIViewController {
     // 書類表示時 URL
     let docUrl: [String] = ["Mobile#docDetail", "#docDetail"]
 
+    //書類表示 ピンチレベル
+    var pinchLevel: CGFloat = 1
+
     override func viewDidLoad() {
         super.viewDidLoad()
 
@@ -67,6 +70,29 @@ class WebViewController: UIViewController {
         // ネットワークオフラインView関連セットアップ
         self.setDisconnectView()
         self.startNetworkMonitor()
+
+        //書類表示時のピンチイン・アウト
+        let pinch = UIPinchGestureRecognizer(target: self, action: #selector(self.pinchHandler))
+        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
+           mainWebView.evaluateJavaScript("document.getElementById(\"mobile-zoom-in\").click();", completionHandler: { (_, _) -> Void in
+           })
+       }// 縮小
+       else if pinchLevel - pinchRatio >= gesture.scale {
+           pinchLevel -= pinchRatio
+           mainWebView.evaluateJavaScript("document.getElementById(\"mobile-zoom-out\").click();", completionHandler: { (_, _) -> Void in
+           })
+       }
     }
 
     override func viewWillAppear(_ animated: Bool) {
@@ -548,8 +574,14 @@ extension WebViewController: SubViewStackEventDelegate {
 extension WebViewController: UIGestureRecognizerDelegate {
     // WebViewでのタップイベントを有効化
     func gestureRecognizerShouldBegin(_ gestureRecognizer: UIGestureRecognizer) -> Bool {
+        //ピンチ開始時はピンチレベルの初期化
+        pinchLevel = 1
         return true
     }
+
+    func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldRecognizeSimultaneouslyWith otherGestureRecognizer: UIGestureRecognizer) -> Bool {
+            return true
+        }
 }
 
 extension WebViewController: UIScrollViewDelegate {