1. A three-dimensional image processing device for performing image correction processing on a left-eye image and a right-eye image included in a twin-lens or multi-viewpoint three-dimensional image, comprising: a depth acquisition unit configured to acquire distance information in a three-dimensional space with respect to a subject included in the left-eye image and the right-eye image; and an image correction unit configured to detect an edge portion area of the subject in the left-eye image and the right-eye image based on the distance information on the subject acquired by the depth acquisition unit, and adjust a disparity of the detected edge portion area of the subject in the left-eye image and the right-eye image such that a normal position of the detected edge portion area of the subject is farther away when the three-dimensional image is three-dimensionally displayed.