diff --git a/src/lang/japanese.txt b/src/lang/japanese.txt
--- a/src/lang/japanese.txt
+++ b/src/lang/japanese.txt
@@ -497,7 +497,7 @@ STR_GRAPH_KEY_BUTTON                                            :{BLACK}説明
 STR_GRAPH_KEY_TOOLTIP                                           :{BLACK}グラフの説明を表示します
 STR_GRAPH_X_LABEL_MONTH                                         :{TINYFONT}{STRING}{} {STRING}
 STR_GRAPH_X_LABEL_MONTH_YEAR                                    :{TINYFONT}{STRING}{} {STRING}{}{NUM}
-STR_GRAPH_Y_LABEL                                               :{TINYFONT}{STRING}-
+STR_GRAPH_Y_LABEL                                               :{TINYFONT}{STRING}
 STR_GRAPH_Y_LABEL_NUMBER                                        :{TINYFONT}{COMMA}
 
 STR_GRAPH_OPERATING_PROFIT_CAPTION                              :{WHITE}営業利益グラフ