A stereoscopic image display apparatus according an embodiment includes: an elemental image display unit having a display face in which pixels having sub-pixels are arranged in a matrix form, the display face being divided into a plurality of elemental images for display; and an optical plate provided on a viewer side of the elemental image display unit, the optical plate having a plurality of lenses arranged periodically with respect to the display face to be respectively associated with the plurality of elemental images, each of the lenses controlling light rays from the pixels which display an associated elemental image. In each lens, the sub-pixels which display an elemental image associated with the lens differing in isolation degree between adjacent sub-pixels depending upon whether a location is in a central portion of the lens or in a peripheral portion of the lens.