In addition to the arrow of the symbol image 37 indicating the scheduled travel course, a symbol image 53 indicating a travel course for lane change to the opposing lane 52 is displayed at the front windshield 15 as illustrated in FIG. 16A. The symbol image 53 is formed as an arrow mark that is similar to the symbol image 44 in FIG. 11A. However, it is not limited thereto. Similarly to the abovementioned embodiment, it is preferable that the symbol image 53 is displayed in a color that is different from and more striking than the color of the symbol image 37. The symbol image 53 may be displayed instead of the symbol image 37.