To make it possible to select one of visual recognition of a stereoscopic image in an X-axis direction of an image display surface and the visual recognition of the stereoscopic image in a Y-axis direction.

A stereoscopic image display optical element 11A arranged on a rectangular image display surface 101 formed by arranging sub-pixels corresponding to R, G, B includes a plurality of cylindrical lenses TS and a plurality of cylindrical lenses YS. The cylindrical lenses TS are configured so as not to have a curvature in an X-axis direction and to have the curvature in a Y-axis direction, and the cylindrical lenses YS are configured so as not to have a curvature in the Y-axis direction and to have the curvature in the X-axis direction. The cylindrical lenses TS and the cylindrical lenses YS are alternately arranged in the X-axis direction.