diff --git a/READMEJP.txt b/READMEJP.txt
index f4fa19e8..a1fab6cd 100644
--- a/READMEJP.txt
+++ b/READMEJP.txt
@@ -217,7 +217,7 @@
         エクスポートを修正・標準化。
         エクスポート方法を選べるようにエクスポート オプションを追加。
         "resource.h"の更新を使いやすく修正。
-    2018.XX.YY ver.4.0
+    2018.03.20 ver.4.0
         バックアップをもっと安全に。
         バックアップを5世代までに制限。
         非標準のリソースIDの解釈を改善。
diff --git a/src/RisohEditor.cpp b/src/RisohEditor.cpp
index 00d75325..13d5ceb3 100644
--- a/src/RisohEditor.cpp
+++ b/src/RisohEditor.cpp
@@ -1468,6 +1468,7 @@ class MMainWnd : public MWindowBase
     void OnOpenReadMe(HWND hwnd);
     void OnOpenReadMeJp(HWND hwnd);
     void OnOpenLicense(HWND hwnd);
+    void OnOpenHyojunka(HWND hwnd);
     void OnDebugTreeNode(HWND hwnd);
     void OnAdviceResH(HWND hwnd);
     void OnUnloadResH(HWND hwnd);
@@ -2807,6 +2808,36 @@ void MMainWnd::OnOpenReadMeJp(HWND hwnd)
     ShellExecuteW(hwnd, NULL, szPath, NULL, NULL, SW_SHOWNORMAL);
 }
 
+void MMainWnd::OnOpenHyojunka(HWND hwnd)
+{
+    WCHAR szPath[MAX_PATH];
+    GetModuleFileNameW(NULL, szPath, _countof(szPath));
+    LPWSTR pch = wcsrchr(szPath, L'\\');
+    if (pch == NULL)
+        return;
+
+    ++pch;
+    size_t diff = pch - szPath;
+    StringCchCopyW(pch, diff, L"HYOJUNKA.txt");
+    if (GetFileAttributesW(szPath) == INVALID_FILE_ATTRIBUTES)
+    {
+        StringCchCopyW(pch, diff, L"..\\HYOJUNKA.txt");
+        if (GetFileAttributesW(szPath) == INVALID_FILE_ATTRIBUTES)
+        {
+            StringCchCopyW(pch, diff, L"..\\..\\HYOJUNKA.txt");
+            if (GetFileAttributesW(szPath) == INVALID_FILE_ATTRIBUTES)
+            {
+                StringCchCopyW(pch, diff, L"..\\..\\..\\HYOJUNKA.txt");
+                if (GetFileAttributesW(szPath) == INVALID_FILE_ATTRIBUTES)
+                {
+                    return;
+                }
+            }
+        }
+    }
+    ShellExecuteW(hwnd, NULL, szPath, NULL, NULL, SW_SHOWNORMAL);
+}
+
 void MMainWnd::OnOpenLicense(HWND hwnd)
 {
     WCHAR szPath[MAX_PATH];
@@ -7186,6 +7217,9 @@ void MMainWnd::OnCommand(HWND hwnd, int id, HWND hwndCtl, UINT codeNotify)
     case ID_OPENLICENSE:
         OnOpenLicense(hwnd);
         break;
+    case ID_OPENHYOJUNKA:
+        OnOpenHyojunka(hwnd);
+        break;
     case ID_DEBUGTREENODE:
         OnDebugTreeNode(hwnd);
         break;
diff --git a/src/lang/ja-JP.rc b/src/lang/ja-JP.rc
index c2d52ea2..fe333853 100644
--- a/src/lang/ja-JP.rc
+++ b/src/lang/ja-JP.rc
@@ -127,6 +127,8 @@ IDR_MAINMENU MENU
         MENUITEM "&README.txtを開く", ID_OPENREADME
         MENUITEM "README&JP.txtを開く", ID_OPENREADMEJP
         MENUITEM SEPARATOR
+        MENUITEM "&HYOJUNKA.txtを開く", ID_OPENHYOJUNKA
+        MENUITEM SEPARATOR
         MENUITEM "&LICENSE.txtを開く", ID_OPENLICENSE
         MENUITEM SEPARATOR
         MENUITEM "バージョン情報(&A)...", ID_ABOUT
diff --git a/src/resource.h b/src/resource.h
index a749f6ab..8054a71b 100644
--- a/src/resource.h
+++ b/src/resource.h
@@ -151,6 +151,7 @@
 #define ID_IDJUMP09             230
 #define ID_SHOWLANGS            231
 #define ID_SHOWHIDETOOLBAR      232
+#define ID_OPENHYOJUNKA         233
 
 #define IDD_REPLACERES          100
 #define IDD_ADDICON             101