A stereoscopic image display device includes a viewpoint division unit that divides an image displayed in a plurality of pixels into images that correspond to k viewpoints, wherein the viewpoint division unit comprises a plurality of viewpoint division units inclined with an inclination angle that satisfies V   A = tan - 1   b × Hp m × Vp , where Hp denotes a pitch of a row direction of the pixels, Vp denotes a pitch of a column direction of the pixels, and m and b are natural numbers, and a number of first pixels arranged in an area defined by a unit of m×b among a plurality of first pixels emitting light transmitting the same viewpoint division unit among the plurality of viewpoint division units is n=b+m−1.