An image generating device has a camerawork information extracting unit (315) that extracts imaging information of a captured image, a composition information calculating unit (316) that decides a cut-out frame for cutting out a new image from the imaging information and the captured image based on a constraint condition, and a composition information shaping unit (317) that cuts out the new image from the captured image by using the cut-out frame and converts a size of the new image to a predetermined size. With this configuration, the new image generated from the captured image becomes a favorable image that is easy to see for a viewer, without requiring skilled imaging techniques during capturing.