According to one embodiment, an image processing device includes a plurality of parallax image generators. Each of the parallax image generators is configured to generate a first image and a second image based on an input image and a parameter for setting a distance between viewpoints. There is a first parallax between the first image and the second image. The first parallax depends on the parameter for setting the distance between viewpoints. The input image is inputted to the parallax image generators in common. A plurality of parameters for setting the distance between viewpoints different from each other are inputted to the parallax image generators, respectively.