An image display apparatus includes a reflective display device, a light source for illuminating the display device, an illumination optical system for guiding light from the light source to the display device, and a display optical system for guiding light from the display device to an eye of an observer. The illumination optical system and the display optical system share an optical surface A having a curvature on a local meridional section. There is a curved surface B provided on the opposite side of the optical surface A to the display device. The optical surface A and optical surface B compose a lens body. Rays emitted from the light source are reflected by the optical surface A of the lens body to illuminate the display device, and reflected light from the display device is transmitted by the optical surface A to enter the lens body. The light then emerges from the optical surface B, and thereafter is guided to the pupil, thus permitting observation of an enlarged image of the image displayed on the display device.