In this case, the virtual image 54 of the own vehicle to perform lane change starts to travel on the travel course of the symbol image 53 so that the virtual image 54 moves out frontward from a position just in front of the front windshield 15 as being similar to the case of FIG. 16A. Then, the virtual image 54 stops at the position of the stop line mark 58, for example, as illustrated in FIG. 16C. At that time, owing to that a brake lamp 59 at the rear is lighted or blinked in red, the virtual vehicle of the virtual image 54 causes the occupant to recognize temporal stop.