To effectively prevent an interruption of an image at a boundary part of respective display units in a multi-display device.

A plurality of the display units 1 are adjacently arranged so as to position display parts 12 on the same plane. A Fresnel lens sheet 3 provided on an emission side spreads light in a direction of separating from a center axis so as to continue the image from the adjacent display unit 3 without being separated at or below a resolution of eyes of a human on an incidence plane which is a concave lens surface. An emission plane of the Fresnel lens sheet 3 is a convex lens surface and bends the light so as to make the spread light advance parallelly to the center axis. The respective display units 3 are controlled by a control system and a moving image display in which display seems to move in a direction crossing the boundary part of the respective display units 3 is performed.