An image display device comprises: a beam splitter which splits an entry light which is taken in from a subject side; an image capture element which converts a first optical image by one of the split entry light to an electrical signal and outputs same as a captured image; a composite image generation unit which generates a digital information image with which a primary subject image in the captured image is aligned; a display panel which displays the digital information image; and an optical prism which superpositions an optical image of the digital information image which is projected from the display panel in a second optical image by the other split entry light and emits same.