An image display device includes an inclined transparent plate, a supporting member configured to support a display device with a display to be capable of projecting the image toward the transparent plate, thereby overlapping the image with a frontal view of the object, side walls each extending along one of side faces of the transparent plate. An outline of the frontal view of the object overlaps at least a part of an outline of the image, a perspective view of the object seen through the transparent plate overlaps the image reflected by the transparent plate, and the walls sandwich the transparent plate so that two spaces at upper side and a rear side of the transparent plate are defined, the object being positioned in the rear side space, the upper side space having a brightness different from that of the rear side space.