diff --git a/sakura_core/cmd/CViewCommander_Search.cpp b/sakura_core/cmd/CViewCommander_Search.cpp
index b010a03e0f..2d0b0dbdbf 100644
--- a/sakura_core/cmd/CViewCommander_Search.cpp
+++ b/sakura_core/cmd/CViewCommander_Search.cpp
@@ -809,7 +809,7 @@ void CViewCommander::Command_REPLACE_ALL()
 	int			nReplaceNum = 0;
 	HWND		hwndStatic = ::GetDlgItem( hwndCancel, IDC_STATIC_KENSUU );
 	WCHAR szLabel[64];
-	_itot( nReplaceNum, szLabel, 10 );
+	_itow( nReplaceNum, szLabel, 10 );
 	::SendMessage( hwndStatic, WM_SETTEXT, 0, (LPARAM)szLabel );
 
 	CLayoutRange sRangeA;	//選択範囲
@@ -1033,7 +1033,7 @@ void CViewCommander::Command_REPLACE_ALL()
 				Progress_SetPos( hwndProgress, nNewPos );
 				nOldPos = nNewPos;
 			}
-			_itot( nReplaceNum, szLabel, 10 );
+			_itow( nReplaceNum, szLabel, 10 );
 			::SendMessage( hwndStatic, WM_SETTEXT, 0, (LPARAM)szLabel );
 		}
 
@@ -1449,7 +1449,7 @@ void CViewCommander::Command_REPLACE_ALL()
 	}
 	//>> 2002/03/26 Azumaiya
 
-	_itot( nReplaceNum, szLabel, 10 );
+	_itow( nReplaceNum, szLabel, 10 );
 	::SendMessage( hwndStatic, WM_SETTEXT, 0, (LPARAM)szLabel );
 
 	if( !cDlgCancel.IsCanceled() ){
diff --git a/sakura_core/dlg/CDlgTagJumpList.cpp b/sakura_core/dlg/CDlgTagJumpList.cpp
index 92a03a0c85..23a312998c 100644
--- a/sakura_core/dlg/CDlgTagJumpList.cpp
+++ b/sakura_core/dlg/CDlgTagJumpList.cpp
@@ -738,7 +738,7 @@ bool CDlgTagJumpList::GetFullPathAndLine( int index, WCHAR *fullPath, int count,
 		const WCHAR	*p = fileName;
 		if( p[0] == L'\\' ){
 			wcscpy( dirFileName, p );
-		}else if( _istalpha( p[0] ) && p[1] == L':' ){
+		}else if( iswalpha( p[0] ) && p[1] == L':' ){
 			wcscpy( dirFileName, p );
 		}else{
 			// 相対パス：連結する
@@ -1617,7 +1617,7 @@ WCHAR* CDlgTagJumpList::GetFullPathFromDepth( WCHAR* pszOutput, int count,
 	const WCHAR	*p = fileName;
 	if( p[0] == L'\\' ){	//ドライブなし絶対パスか？
 		wcscpy( pszOutput, p );	//何も加工しない。
-	}else if( _istalpha( p[0] ) && p[1] == L':' ){	//絶対パスか？
+	}else if( iswalpha( p[0] ) && p[1] == L':' ){	//絶対パスか？
 		wcscpy( pszOutput, p );	//何も加工しない。
 	}else{
 		for( int i = 0; i < depth; i++ ){
diff --git a/sakura_core/env/CFileNameManager.cpp b/sakura_core/env/CFileNameManager.cpp
index a0c8185660..287d151e44 100644
--- a/sakura_core/env/CFileNameManager.cpp
+++ b/sakura_core/env/CFileNameManager.cpp
@@ -239,7 +239,7 @@ bool CFileNameManager::ExpandMetaToFolder( LPCWSTR pszSrc, LPWSTR pszDes, int nD
 						szMeta, szPath, _countof( szPath ) );
 				}
 				if( false == bFolderPath || L'\0' == szPath[0] ){
-					pStr = _tgetenv( szMeta );
+					pStr = _wgetenv( szMeta );
 					// 環境変数
 					if( NULL != pStr ){
 						nPathLen = wcslen( pStr );
diff --git a/sakura_core/env/CShareData_IO.cpp b/sakura_core/env/CShareData_IO.cpp
index 79d304fd9b..f5bcb8c9a1 100644
--- a/sakura_core/env/CShareData_IO.cpp
+++ b/sakura_core/env/CShareData_IO.cpp
@@ -118,7 +118,7 @@ bool CShareData_IO::ShareData_IO_2( bool bRead )
 		DWORD mH, mL, lH, lL;
 		mH = mL = lH = lL = 0;	// ※ 古～い ini だと "szVersion" は無い
 		if( cProfile.IOProfileData(LTEXT("Other"), L"szVersion", StringBufferW(iniVer)) )
-			_stscanf( iniVer, L"%u.%u.%u.%u", &mH, &mL, &lH, &lL );
+			swscanf( iniVer, L"%u.%u.%u.%u", &mH, &mL, &lH, &lL );
 		DWORD dwMS = (DWORD)MAKELONG(mL, mH);
 		DWORD dwLS = (DWORD)MAKELONG(lL, lH);
 		DLLSHAREDATA* pShareData = &GetDllShareData();
diff --git a/sakura_core/func/CKeyBind.cpp b/sakura_core/func/CKeyBind.cpp
index d5c7217ffb..cf066172ef 100644
--- a/sakura_core/func/CKeyBind.cpp
+++ b/sakura_core/func/CKeyBind.cpp
@@ -399,7 +399,7 @@ WCHAR*	CKeyBind::MakeMenuLabel(const WCHAR* sName, const WCHAR* sKey)
 	}
 	else {
 		if( !GetDllShareData().m_Common.m_sMainMenu.m_bMainMenuKeyParentheses
-			  && (((p = wcschr( sName, sKey[0])) != NULL) || ((p = wcschr( sName, _totlower(sKey[0]))) != NULL)) ){
+			  && (((p = wcschr( sName, sKey[0])) != nullptr) || ((p = wcschr( sName, towlower(sKey[0]))) != nullptr)) ){
 			// 欧文風、使用している文字をアクセスキーに
 			wcscpy_s( sLabel, _countof(sLabel), sName );
 			sLabel[p-sName] = L'&';
diff --git a/sakura_core/macro/CMacroFactory.cpp b/sakura_core/macro/CMacroFactory.cpp
index b2c5c90d6d..124e4000fe 100644
--- a/sakura_core/macro/CMacroFactory.cpp
+++ b/sakura_core/macro/CMacroFactory.cpp
@@ -36,7 +36,7 @@ std::wstring CMacroFactory::Ext2Key(const WCHAR *ext)
 	}
 	
 	std::wstring key = ext;
-	std::transform( key.begin(), key.end(), key.begin(), _totlower);
+	std::transform( key.begin(), key.end(), key.begin(), towlower);
 
 	return key;
 }
diff --git a/sakura_core/prop/CPropComMacro.cpp b/sakura_core/prop/CPropComMacro.cpp
index ee12ff5d12..7f43550eed 100644
--- a/sakura_core/prop/CPropComMacro.cpp
+++ b/sakura_core/prop/CPropComMacro.cpp
@@ -272,7 +272,7 @@ void CPropMacro::SetData( HWND hwndDlg )
 	
 	//	マクロ停止ダイアログ表示待ち時間
 	WCHAR szCancelTimer[16] = {0};
-	::DlgItem_SetText( hwndDlg, IDC_MACROCANCELTIMER, _itot(m_Common.m_sMacro.m_nMacroCancelTimer, szCancelTimer, 10) );
+	::DlgItem_SetText( hwndDlg, IDC_MACROCANCELTIMER, _itow(m_Common.m_sMacro.m_nMacroCancelTimer, szCancelTimer, 10) );
 
 	return;
 }
@@ -422,7 +422,7 @@ void CPropMacro::InitDialog( HWND hwndDlg )
 		sItem.mask = LVIF_TEXT | LVIF_PARAM;
 		sItem.iItem = pos;
 		sItem.iSubItem = 0;
-		_itot( pos, buf, 10 );
+		_itow( pos, buf, 10 );
 		sItem.pszText = buf;
 		sItem.lParam = pos;
 		ListView_InsertItem( hListView, &sItem );
diff --git a/sakura_core/prop/CPropComPlugin.cpp b/sakura_core/prop/CPropComPlugin.cpp
index 155987b4f8..ef82a1ee88 100644
--- a/sakura_core/prop/CPropComPlugin.cpp
+++ b/sakura_core/prop/CPropComPlugin.cpp
@@ -341,7 +341,7 @@ void CPropPlugin::SetData_LIST( HWND hwndDlg )
 		sItem.mask = LVIF_TEXT | LVIF_PARAM;
 		sItem.iItem = index;
 		sItem.iSubItem = 0;
-		_itot( index, buf, 10 );
+		_itow( index, buf, 10 );
 		sItem.pszText = buf;
 		sItem.lParam = index;
 		ListView_InsertItem( hListView, &sItem );
diff --git a/sakura_core/typeprop/CDlgTypeAscertain.cpp b/sakura_core/typeprop/CDlgTypeAscertain.cpp
index dc14dac889..68fca55933 100644
--- a/sakura_core/typeprop/CDlgTypeAscertain.cpp
+++ b/sakura_core/typeprop/CDlgTypeAscertain.cpp
@@ -66,7 +66,7 @@ BOOL CDlgTypeAscertain::OnBnClicked( int wID )
 		m_psi->sColorFile.clear();
 		m_psi->nColorType = Combo_GetCurSel( GetItemHwnd( IDC_COMBO_COLORS ) ) - 1;
 		if (m_psi->nColorType >= MAX_TYPES && Combo_GetLBText( GetItemHwnd( IDC_COMBO_COLORS ), m_psi->nColorType + 1, buff1)) {
-			if (_stscanf( buff1, L"File -- %ls", buff2 ) > 0) {
+			if (swscanf( buff1, L"File -- %ls", buff2 ) > 0) {
 				m_psi->sColorFile = buff2;
 				m_psi->nColorType = MAX_TYPES;
 			}
diff --git a/sakura_core/uiparts/CMenuDrawer.cpp b/sakura_core/uiparts/CMenuDrawer.cpp
index fde44c781b..62707ed51d 100644
--- a/sakura_core/uiparts/CMenuDrawer.cpp
+++ b/sakura_core/uiparts/CMenuDrawer.cpp
@@ -1424,7 +1424,7 @@ WCHAR CMenuDrawer::GetAccelCharFromLabel( const WCHAR* pszLabel )
 			if( L'&' == pszLabel[i + 1]  ){
 				i++;
 			}else{
-				return (WCHAR)_totupper( pszLabel[i + 1] );
+				return (WCHAR)towupper( pszLabel[i + 1] );
 			}
 		}
 	}
@@ -1451,7 +1451,7 @@ LRESULT CMenuDrawer::OnMenuChar( HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lPa
 		chUser += '@';
 	}
 	else {
-		chUser = (WCHAR)_totupper( chUser );
+		chUser = (WCHAR)towupper( chUser );
 	}
 
 	// 2011.11.18 vector化
diff --git a/sakura_core/util/file.cpp b/sakura_core/util/file.cpp
index 4cbd67add2..750388a83f 100644
--- a/sakura_core/util/file.cpp
+++ b/sakura_core/util/file.cpp
@@ -175,7 +175,7 @@ bool IsLocalDrive( const WCHAR* pszDrive )
 	long	lngRet;
 
 	if( iswalpha(pszDrive[0]) ){
-		auto_sprintf(szDriveType, L"%c:\\", _totupper(pszDrive[0]));
+		auto_sprintf(szDriveType, L"%c:\\", towupper(pszDrive[0]));
 		lngRet = GetDriveType( szDriveType );
 		if( lngRet == DRIVE_REMOVABLE || lngRet == DRIVE_CDROM || lngRet == DRIVE_REMOTE )
 		{
diff --git a/sakura_core/util/format.cpp b/sakura_core/util/format.cpp
index e488aa082e..12fa21e441 100644
--- a/sakura_core/util/format.cpp
+++ b/sakura_core/util/format.cpp
@@ -108,15 +108,15 @@ UINT32 ParseVersion( const WCHAR* sVer )
 			else p++;
 			nShift = 0x20;
 		}
-		else if( !_istdigit(*p) ){
+		else if( !iswdigit(*p) ){
 			nShift = -0x80;
 		}
 		else{
 			nShift = 0;
 		}
-		while( *p && !_istdigit(*p) ){ p++; }
+		while( *p && !iswdigit(*p) ){ p++; }
 		//数値の抽出
-		for( nVer = 0, nDigit = 0; _istdigit(*p); p++ ){
+		for( nVer = 0, nDigit = 0; iswdigit(*p); p++ ){
 			if( ++nDigit > 2 )break;	//数字は2桁までで止める
 			nVer = nVer * 10 + *p - L'0';
 		}
diff --git a/sakura_core/util/string_ex.h b/sakura_core/util/string_ex.h
index e9036ad349..f6bce59122 100644
--- a/sakura_core/util/string_ex.h
+++ b/sakura_core/util/string_ex.h
@@ -185,7 +185,7 @@ inline int auto_sprintf(WCHAR* buf, const WCHAR* format, ...) { va_list args; va
 
 inline int auto_vsprintf_s(ACHAR* buf, size_t nBufCount, const ACHAR* format, va_list& v) { return ::_vsnprintf_s(buf, nBufCount, _TRUNCATE, format, v); }
 inline int auto_vsprintf_s(WCHAR* buf, size_t nBufCount, const WCHAR* format, va_list& v) { return ::_vsnwprintf_s(buf, nBufCount, _TRUNCATE, format, v); }
-#define auto_snprintf_s(buf, nBufCount, format, ...)	::_sntprintf_s((buf), nBufCount, _TRUNCATE, (format), __VA_ARGS__)
+#define auto_snprintf_s(buf, nBufCount, format, ...)	::_snwprintf_s((buf), nBufCount, _TRUNCATE, (format), __VA_ARGS__)
 
 std::wstring& eos(std::wstring& strOut, size_t cchOut);
 std::string& eos(std::string& strOut, size_t cchOut);
diff --git a/sakura_core/view/CEditView_Command.cpp b/sakura_core/view/CEditView_Command.cpp
index 647db82da0..6ca43052be 100644
--- a/sakura_core/view/CEditView_Command.cpp
+++ b/sakura_core/view/CEditView_Command.cpp
@@ -207,7 +207,7 @@ open_c:;
 	_wsplitpath( GetDocument()->m_cDocFile.GetFilePath(), szDrive, szDir, szFname, szExt );
 
 	for( i = 0; i < open_extno; i++ ){
-		_tmakepath( szPath, szDrive, szDir, szFname, open_ext[i] );
+		_wmakepath( szPath, szDrive, szDir, szFname, open_ext[i] );
 		if( !fexist(szPath) ){
 			if( i < open_extno - 1 )
 				continue;