diff --git a/modules/ShGraph/ShGraph.c b/modules/ShGraph/ShGraph.c
index 1993c60..b4c9567 100644
--- a/modules/ShGraph/ShGraph.c
+++ b/modules/ShGraph/ShGraph.c
@@ -37,7 +37,7 @@
 #include "ags.h"
 #include "counter.h"
 #include "music.h"
-#include "graphicsdevice.h"
+#include "sdl_core.h"
 
 #define SLOT 40
 
diff --git a/modules/ShPort/ShPort.c b/modules/ShPort/ShPort.c
index dede7e1..3dd9ef8 100644
--- a/modules/ShPort/ShPort.c
+++ b/modules/ShPort/ShPort.c
@@ -35,7 +35,7 @@
 #include "system.h"
 #include "xsystem35.h"
 #include "modules.h"
-#include "graphicsdevice.h"
+#include "sdl_core.h"
 
 // キー変換テーブル
 #define KEYMAP_MAX 8
diff --git a/src/ags.c b/src/ags.c
index ccb2e24..20718e9 100644
--- a/src/ags.c
+++ b/src/ags.c
@@ -31,7 +31,7 @@
 #include "portab.h"
 #include "xsystem35.h"
 #include "ags.h"
-#include "graphicsdevice.h"
+#include "sdl_core.h"
 #include "alpha_plane.h"
 #include "counter.h"
 #include "utfsjis.h"
diff --git a/src/cmd2F.c b/src/cmd2F.c
index db077de..b93181b 100644
--- a/src/cmd2F.c
+++ b/src/cmd2F.c
@@ -35,7 +35,7 @@
 #include "utfsjis.h"
 #include "hankaku.h"
 #include "ags.h"
-#include "graphicsdevice.h"
+#include "sdl_core.h"
 #include "ald_manager.h"
 #include "LittleEndian.h"
 #include "gametitle.h"
diff --git a/src/cmdi.c b/src/cmdi.c
index 327f901..ca8ce1c 100644
--- a/src/cmdi.c
+++ b/src/cmdi.c
@@ -27,7 +27,7 @@
 #include "portab.h"
 #include "xsystem35.h"
 #include "ags.h"
-#include "graphicsdevice.h"
+#include "sdl_core.h"
 #include "input.h"
 
 #define REPEAT_RATE_FAST 60 
diff --git a/src/cursor.c b/src/cursor.c
index e5187d4..d2e04d4 100644
--- a/src/cursor.c
+++ b/src/cursor.c
@@ -29,7 +29,7 @@
 #include "cursor.h"
 #include "LittleEndian.h"
 #include "ald_manager.h"
-#include "graphicsdevice.h"
+#include "sdl_core.h"
 
 static CursorHeader    cursorHeader;
 static TCursorDirEntry cursordirentry;
diff --git a/src/graphicsdevice.h b/src/graphicsdevice.h
deleted file mode 100644
index dd8a438..0000000
--- a/src/graphicsdevice.h
+++ /dev/null
@@ -1,31 +0,0 @@
-/*
- * graphicdevice.h  実際の graphicデバイスのinclude
- *
- * Copyright (C) 1997-1998 Masaki Chikama (Wren) <chikama@kasumi.ipl.mech.nagoya-u.ac.jp>
- *               1998-                           <masaki-c@is.aist-nara.ac.jp>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
- *
-*/
-/* $Id: graphicsdevice.h,v 1.6 2006/04/21 16:40:48 chikama Exp $ */
-
-#ifndef __GRAPHICDEVICE__
-#define __GRAPHICDEVICE__
-
-#include "config.h"
-
-#include "sdl_core.h"
-
-#endif /* !__GRAPHICDEVICE__ */
diff --git a/src/image.c b/src/image.c
index 37d9f11..768c253 100644
--- a/src/image.c
+++ b/src/image.c
@@ -29,7 +29,7 @@
 #include "cg.h"
 #include "config.h"
 #include "nact.h"
-#include "graphicsdevice.h"
+#include "sdl_core.h"
 #include "alpha_plane.h"
 #include "ags.h"
 
diff --git a/src/input.h b/src/input.h
index aba3faf..d2e9805 100644
--- a/src/input.h
+++ b/src/input.h
@@ -26,7 +26,7 @@
 
 #include "portab.h"
 #include "graphics.h"
-#include "graphicsdevice.h"
+#include "sdl_core.h"
 
 #define SYS35KEY_NULL  0
 #define SYS35KEY_UP    1
diff --git a/src/xsystem35.c b/src/xsystem35.c
index 36c1001..5ad7bf4 100644
--- a/src/xsystem35.c
+++ b/src/xsystem35.c
@@ -61,7 +61,7 @@
 #include "counter.h"
 #include "ags.h"
 #include "font.h"
-#include "graphicsdevice.h"
+#include "sdl_core.h"
 #include "menu.h"
 #include "music.h"
 #include "cdrom.h"