diff --git a/bin/lang/english.json b/bin/lang/english.json
index 9dfabac..0b8d5a5 100644
--- a/bin/lang/english.json
+++ b/bin/lang/english.json
@@ -86,5 +86,6 @@
 "MessageAllFileFolder":"All files and folders(*.*)",
 "MessageTitleInputDialog":"Please select input file or folder",
 "MessageTimeLeftUnkown":"Time Left: Unkown",
-"MessageTimeLeft":"Time Left"
+"MessageTimeLeft":"Time Left",
+"MessageNoOverwrite":"Already file exists in the destination: %s"
 }
diff --git a/bin/lang/japanese.json b/bin/lang/japanese.json
index 678c011..a915075 100644
--- a/bin/lang/japanese.json
+++ b/bin/lang/japanese.json
@@ -86,5 +86,6 @@
 "MessageAllFileFolder":"すべてのファイル、フォルダ(*.*)",
 "MessageTitleInputDialog":"入力するファイルかフォルダを選択してください",
 "MessageTimeLeftUnkown":"残り時間: 不明",
-"MessageTimeLeft":"残り時間"
+"MessageTimeLeft":"残り時間",
+"MessageNoOverwrite":"出力先に既にファイルが存在します: %s"
 }
diff --git a/waifu2x-caffe-gui/MainDialog.cpp b/waifu2x-caffe-gui/MainDialog.cpp
index 8bc5562..e04d308 100644
--- a/waifu2x-caffe-gui/MainDialog.cpp
+++ b/waifu2x-caffe-gui/MainDialog.cpp
@@ -690,6 +690,18 @@ void DialogEvent::ProcessWaifu2x()
 		const auto fileNum = file_paths.size();
 		for (const auto &p : file_paths)
 		{
+			if (isOutputNoOverwrite && boost::filesystem::exists(p.second)) // �㏑���֎~�Ȃ烁�b�Z�[�W�\�����Ė���
+			{
+				SendMessage(dh, WM_ON_WAIFU2X_NO_OVERWRITE, (WPARAM)p.first.c_str(), (LPARAM)p.second.c_str());
+
+				num++;
+				ProgessFunc(maxFile, num);
+
+				count++;
+
+				continue;
+			}
+
 			ret = w.waifu2x(p.first, p.second, [this]()
 			{
 				return cancelFlag;
@@ -1272,6 +1284,17 @@ void DialogEvent::OnWaifu2xError(HWND hWnd, WPARAM wParam, LPARAM lParam, LPVOID
 	}
 }
 
+void DialogEvent::OnWaifu2xNoOverwrite(HWND hWnd, WPARAM wParam, LPARAM lParam, LPVOID lpData)
+{
+	const TCHAR *input = (const TCHAR *)wParam;
+	const TCHAR *output = (const TCHAR *)lParam;
+
+	TCHAR msg[1024] = TEXT("");
+	_stprintf(msg, langStringList.GetString(L"MessageNoOverwrite").c_str(), output);
+
+	AddLogMessage(msg);
+}
+
 void DialogEvent::SetWindowTextLang()
 {
 #define SET_WINDOW_TEXT(id) SetWindowTextW(GetDlgItem(dh, id), langStringList.GetString(L#id).c_str());
diff --git a/waifu2x-caffe-gui/MainDialog.h b/waifu2x-caffe-gui/MainDialog.h
index 0c06633..5abf787 100644
--- a/waifu2x-caffe-gui/MainDialog.h
+++ b/waifu2x-caffe-gui/MainDialog.h
@@ -17,6 +17,7 @@
 
 #define WM_FAILD_CREATE_DIR (WM_APP + 5)
 #define WM_ON_WAIFU2X_ERROR (WM_APP + 6)
+#define WM_ON_WAIFU2X_NO_OVERWRITE (WM_APP + 8)
 #define WM_END_THREAD (WM_APP + 7)
 
 
@@ -169,6 +170,8 @@ public:
 
 	void OnWaifu2xError(HWND hWnd, WPARAM wParam, LPARAM lParam, LPVOID lpData);
 
+	void OnWaifu2xNoOverwrite(HWND hWnd, WPARAM wParam, LPARAM lParam, LPVOID lpData);
+
 	void SetWindowTextLang();
 
 	void SetDepthAndQuality(const bool SetDefaultQuality = true);
diff --git a/waifu2x-caffe-gui/Source.cpp b/waifu2x-caffe-gui/Source.cpp
index 97edb63..841ea61 100644
--- a/waifu2x-caffe-gui/Source.cpp
+++ b/waifu2x-caffe-gui/Source.cpp
@@ -96,6 +96,7 @@ int WINAPI WinMain(HINSTANCE hInstance,
 	cDialog.SetEventCallBack(SetClassFunc(DialogEvent::OnDialogEnd, &cDialogEvent), NULL, WM_CLOSE);
 	cDialog.SetEventCallBack(SetClassFunc(DialogEvent::OnFaildCreateDir, &cDialogEvent), NULL, WM_FAILD_CREATE_DIR);
 	cDialog.SetEventCallBack(SetClassFunc(DialogEvent::OnWaifu2xError, &cDialogEvent), NULL, WM_ON_WAIFU2X_ERROR);
+	cDialog.SetEventCallBack(SetClassFunc(DialogEvent::OnWaifu2xNoOverwrite, &cDialogEvent), NULL, WM_ON_WAIFU2X_NO_OVERWRITE);
 	cDialog.SetEventCallBack(SetClassFunc(DialogEvent::WaitThreadExit, &cDialogEvent), NULL, WM_END_THREAD);
 	cDialog.SetEventCallBack(SetClassFunc(DialogEvent::Timer, &cDialogEvent), NULL, WM_TIMER);