To obtain an attachable video display device which can make its attaching part more smal in size and light in weight.

A video output device 4 is provided with a circuit which converts a video signal into visible video. The visible video outputted by a video output part 4a of the video device 4 is made incident on the end surface 2a' of one end part 2a of an optical fiber 2 through a convex lens part 12, a concave lens part 13, and a light guide-out part 15, transmitted by the optical fiber 2, and outputted from the other end part. Then the outputted video is enlarged by a lens (10), reflected by a spectacle lens 6 consisting of a half-mirror of a spectacle part 1, and projected on the eyeball of a user.