diff --git a/resolver/cpp/route.cpp b/resolver/cpp/route.cpp
index 866232dcea0479f161deac06eda48797d9e8fa0d..58e7627028229bfdb8968eba097d994a6917c137 100644
--- a/resolver/cpp/route.cpp
+++ b/resolver/cpp/route.cpp
@@ -9,7 +9,6 @@
 extern Board* board;
 
 bool routing(int trgt_line_id){
-
 	Line* trgt_line = board->line(trgt_line_id);
 	trgt_line->clearTrack();
 	
@@ -255,6 +254,8 @@ bool routing(int trgt_line_id){
 		}
 		
 		if(!update) continue;
+		
+		// コストマップの更新があった場合
 		if(trgt_box->isTypeNumber()){
 			if(trgt_box->getIndex() == trgt_line_id){
 				if(trgt_ibox->cost < goal_cost) goal_cost = trgt_ibox->cost;
@@ -295,7 +296,8 @@ bool routing(int trgt_line_id){
 			qu.push(next);
 		}
 	}
-	
+		
+	//コストマップは完成したのでバックトラック
 	int now_x = trgt_line->getSinkX();
 	int now_y = trgt_line->getSinkY();
 	int now_z = trgt_line->getSinkZ();
@@ -330,15 +332,15 @@ bool routing(int trgt_line_id){
 		case DOWN:  // 下へ
 			now_z = now_z - 1; next_id = trgt_d.c_d; break;
 	}
-
 	while(1){
 
 		Point p = {now_x, now_y, now_z};
 		trgt_line->pushPointToTrack(p);
 
 		if(now_x==trgt_line->getSourceX() && now_y==trgt_line->getSourceY() && now_z==trgt_line->getSourceZ()) break;
-
+		
 		trgt_d = my_board[now_z][now_y][now_x].d;
+		
 
 		switch(next_id){
 			case NORTH:
@@ -399,28 +401,28 @@ bool isInserted(int x,int y,int z){
 int cost_parallel(int trgt_line_id, int x, int y, int z){
 	//同Z平面上で隣接する(延べ)配線数をカウント
 	Box* neibour_box;
-	int cost=0;
+	int p_cost=0;
 	if(x-1>=0){
 		neibour_box = board->box(x-1,y,z);
-		if(neibour_box->checkLine() && neibour_box->getIndex() != trgt_line_id)
-		cost++;
+		if(neibour_box->isTypeNumber() && neibour_box->getIndex() != trgt_line_id)
+		p_cost++;
 	}
 	if(x+1<board->getSizeX()){
 		neibour_box = board->box(x+1,y,z);
-		if(neibour_box->checkLine() && neibour_box->getIndex() != trgt_line_id)
-		cost++;
+		if(neibour_box->isTypeNumber() && neibour_box->getIndex() != trgt_line_id)
+		p_cost++;
 	}
 	if(y-1>=0){
 		neibour_box = board->box(x,y-1,z);
-		if(neibour_box->checkLine() && neibour_box->getIndex() != trgt_line_id)
-		cost++;
+		if(neibour_box->isTypeNumber() && neibour_box->getIndex() != trgt_line_id)
+		p_cost++;
 	}
 	if(y+1<board->getSizeY()){
 		neibour_box = board->box(x,y+1,z);
-		if(neibour_box->checkLine() && neibour_box->getIndex() != trgt_line_id)
-		cost++;
+		if(neibour_box->isTypeNumber() && neibour_box->getIndex() != trgt_line_id)
+		p_cost++;
 	}
-	return cost;
+	return p_cost;
 }
 
 void recordLine(int trgt_line_id){