The present invention relates to a autostereoscopic image display device capable of observing a natural three-dimensional image without crosstalk or pseudo-stereoscopic zone between optimal viewpoints and without using special glasses. The three-dimensional image display device of the present invention includes: a display panel configured to display image information of at least two viewpoints; an optical substrate that is separately disposed from the display panel at a predetermined distance, the optical substrate being configured to form at least one intermediate viewing zone between left and right viewing zones included in base viewing zones corresponding to two viewpoints, which are observed when a position of an observer moves horizontally; and a control unit configured to provide the image information corresponding to the respective viewpoints at the base viewing zones and remove image information from the at least one intermediate viewing zone.