According to an image processing device includes an acquiring unit and a correcting unit. The acquiring unit is configured to acquire a stereoscopic image containing a plurality of parallax images each having a mutually different parallax. The correcting unit is configured to perform, for each pixel of the stereoscopic image, correction to set a parallax number of a parallax image viewed at a viewpoint position to a first parallax number of a parallax image to be viewed at the viewpoint position by using correction data representing a difference value between the first parallax number and a second parallax number of a parallax image that is actually viewed at the viewpoint position and on which distortion correction for correcting distortion of light beams has been performed.