The purpose of the present invention is to make a facial expression when the eyes are moved more natural. An image processing device (100) is provided with the following: an image acquisition unit (5a) for acquiring an image that includes the eyes; an iris detection unit (5c) for detecting from the acquired image the iris region of the eyes; and an eye image generation unit (5f) for supplementing a deficient portion of the iris region so that the shape of the detected iris region becomes substantially circular.