1. An image processing device, comprising a control unit configured to: receive a photographed image; divide a subject in the photographed image into a plurality of regions; correct a size of each of the divided regions such that a ratio of vertical width to horizontal width in each of said regions and ratios of areas between the divided regions respectively match corresponding prescribed target ratios; and connect the divided regions, the sizes of which have been corrected, wherein, in dividing the subject in the photographed image into the plurality of regions, the control unit is configured to: recognize a face region and a torso region of the subject in the photographed image; attempt to detect, within a prescribed vertical range, a boundary line of clothes that vertically divides the recognized torso region; when the boundary line is detected, recognize a region above said boundary line on the torso region as an upper body region and a region below said boundary line on the torso region as a lower body region; and divide the subject in the photographed image into the face region, the upper body region, and the lower body region, and wherein, in connecting the divided regions, the control unit is configured to: when the divided regions include the upper body region and the lower body region, connect the upper body region to the lower body region and designate a first connected region within a prescribed vertical range from a point at which the upper body region and the lower body region are connected; set a horizontal length of a center of the first connected region to a value determined in accordance with a horizontal length of a top of the first connected region and a horizontal length of a bottom of the first connected region; and correct an outline shape on both left-right sides of the first connected region such that respective quadratic curves are drawn from both left-right ends of the center of the first connected region to corresponding left-right sides of a top of the first connected region and to corresponding left-right sides of a bottom of the first connected region.