Auxiliary display areas 32b, 32a, 32c are arranged at the right, left, and center below the main display area 31 along a lower edge side of the front windshield 15. The right-left auxiliary display areas 32b, 32a may be used for projecting rear view pictures taken by the right-left rear cameras 18b, 18a or processed images thereof. The center auxiliary display area 32c may be used for projecting a processed image of a target detected by the radar sensor 20 at the rear of the automobile 14, a picture taken by the center rear camera arranged in place of the radar sensor, or a processed image thereof.