diff --git a/src/sdlmain.cpp b/src/sdlmain.cpp
index e00bf04..b849dae 100644
--- a/src/sdlmain.cpp
+++ b/src/sdlmain.cpp
@@ -28,15 +28,19 @@ int main(int argc, char *argv[])
 
 	g_window = SDL_CreateWindow(buf, SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, 640, 400, 0);
 
+	const char *fontfile = "MTLc3m.ttf";
+
 	for (int i = 1; i < argc; i++) {
 		if (strcmp(argv[i], "-antialias") == 0)
 			ags_setAntialiasedStringMode(1);
 		if (strcmp(argv[i], "-savedir") == 0)
 			FILEIO::SetSaveDir(argv[++i]);
+		if (strcmp(argv[i], "-fontfile") == 0)
+			fontfile = argv[++i];
 	}
 
 	// system3 初期化
-	NACT* nact = new NACT();
+	NACT* nact = new NACT(fontfile);
 
 	_TCHAR title[128];
 	if(nact->get_title(title, 128)) {
diff --git a/src/sys/ags.cpp b/src/sys/ags.cpp
index cb959c7..00d9311 100644
--- a/src/sys/ags.cpp
+++ b/src/sys/ags.cpp
@@ -33,7 +33,7 @@ static SDL_Surface* display_surface;
 	box[n].ey = y2; \
 }
 
-AGS::AGS(NACT* parent) : nact(parent)
+AGS::AGS(NACT* parent, const char* fontfile) : nact(parent)
 {
 	sdlRenderer = SDL_CreateRenderer(g_window, -1, 0);
 	SDL_RenderSetLogicalSize(sdlRenderer, 640, 400);
@@ -60,12 +60,15 @@ AGS::AGS(NACT* parent) : nact(parent)
 
 	// �t�H���g
 	TTF_Init();
-	const char fontfile[] = "MTLc3m.ttf";
 	hFont16 = TTF_OpenFont(fontfile, 16);
 	hFont24 = TTF_OpenFont(fontfile, 24);
 	hFont32 = TTF_OpenFont(fontfile, 32);
 	hFont48 = TTF_OpenFont(fontfile, 48);
 	hFont64 = TTF_OpenFont(fontfile, 64);
+	if (!hFont16 || !hFont24 || !hFont32 || !hFont48 || !hFont64) {
+		printf("Cannot open font file %s\n", fontfile);
+		exit(1);
+	}
 
 	// �J�[�\��������
 	for(int i = 0; i < 10; i++) {
diff --git a/src/sys/ags.h b/src/sys/ags.h
index 6a2f854..983a1bb 100644
--- a/src/sys/ags.h
+++ b/src/sys/ags.h
@@ -99,7 +99,7 @@ private:
 	uint32 fader_screen[640 * 480];
 
 public:
-	AGS(NACT* parent);
+	AGS(NACT* parent, const char* fontfile);
 	~AGS();
 
 	void flush_screen(bool update);
diff --git a/src/sys/nact.cpp b/src/sys/nact.cpp
index 4ca1f66..08ca0c4 100644
--- a/src/sys/nact.cpp
+++ b/src/sys/nact.cpp
@@ -13,7 +13,7 @@
 
 // ������
 
-NACT::NACT()
+NACT::NACT(const char* fontfile)
 {
 	mouse_x = mouse_y = 0;
 
@@ -110,7 +110,7 @@ NACT::NACT()
 #endif
 
 	// �e��N���X����
-	ags = new AGS(this);
+	ags = new AGS(this, fontfile);
 	mako = new MAKO(this);
 
 #ifdef USE_JOY
diff --git a/src/sys/nact.h b/src/sys/nact.h
index ea7d1b9..794cb28 100644
--- a/src/sys/nact.h
+++ b/src/sys/nact.h
@@ -231,7 +231,7 @@ private:
 	void release_console();
 
 public:
-	NACT();
+	NACT(const char* fontfile);
 	~NACT();
 
 	void mainloop();