A three-dimensional image display device includes a display panel that includes a plurality of pixels arranged in a matrix shape; and a viewpoint divider that includes a plurality of viewpoint dividing units that are inclined at a tilt angle. Letting a row-directional pitch and a column-directional pitch of the pixels be respectively denoted as Hp and Vp, where Hp>Vp, the tilt angle satisfies the following equation: A = tan - 1 ⁢ b * Hp ( 3 ⁢ b + c ) * Vp , where c is −1 or 1, and b is a natural number that is greater than 1.