An image displaying device includes a light diffuser and an image superposing unit. The light diffuser includes an incident side and an emergent side. The image superposing unit emerges therefrom a plurality of image lights, and superposes the plurality of image lights onto the incident side, wherein the plurality of superposed image lights pass through the light diffuser, and the light diffuser only displays an image corresponding to one of the plurality of image lights in an observation direction on the emergent side.