diff --git a/AgileWorks/AgileWorks/WebView/View/SubView/SubViewStack.swift b/AgileWorks/AgileWorks/WebView/View/SubView/SubViewStack.swift
index db0bbdb5451d8f6f6289b1fd28c27e51ca10239b..c2b33893ced346efc8d3f66eca1a73875ac0840b 100644
--- a/AgileWorks/AgileWorks/WebView/View/SubView/SubViewStack.swift
+++ b/AgileWorks/AgileWorks/WebView/View/SubView/SubViewStack.swift
@@ -26,7 +26,6 @@ class SubViewStack: NSObject {
         // 回転時リサイズ設定
         webView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
         webViews.append(webView)
-        webView.uiDelegate = self
         webView.allowsBackForwardNavigationGestures = true
 
         let swipeRightGesture: UISwipeGestureRecognizer = UISwipeGestureRecognizer(target: self, action: #selector(self.handleRight(sender:)))
diff --git a/AgileWorks/AgileWorks/WebView/View/WebViewController.swift b/AgileWorks/AgileWorks/WebView/View/WebViewController.swift
index 5e877a1e72590cff1e113c07193622aefebe9444..d783e4e5eba6d3a62290066e7f060e3e56353446 100644
--- a/AgileWorks/AgileWorks/WebView/View/WebViewController.swift
+++ b/AgileWorks/AgileWorks/WebView/View/WebViewController.swift
@@ -466,6 +466,7 @@ extension WebViewController: WKUIDelegate {
         if navigationAction.targetFrame?.isMainFrame != true {
             subWebView = WKWebView(frame: self.formView.bounds, configuration: configuration)
             subWebView.navigationDelegate = self
+            subWebView.uiDelegate = self
             subViewStack.push(subWebView, superView: mainWebView)
             subWebView.load(navigationAction.request)