Further, a virtual vehicle of the own vehicle that performs lane change is displayed at the front windshield 15 as a moving image of a virtual image 54. The virtual image 54 is displayed so that the virtual vehicle of the own vehicle travels on the arrow of the symbol image 53 indicating the travel course for lane change as having the arrow as the trajectory therefor. Similarly to the abovementioned embodiment, it is also preferable that the virtual image 54 is displayed, for example, as being entirely translucent in white or a light color to the extent that at least outline of the own vehicle is recognizable so as to prevent misrecognition and confusion with an actual vehicle for the occupant.