There is provided an image processor that displays a shadow caused by an eyelid or the like on an eye of a character object without causing an unnatural feeling to a user while suppressing an increase of processing load. In the present invention, a shadow polygon (60) for representing a shadow occurring in an eye region (50) of a character object (player character object (46)) that is placed in a virtual three-dimensional space is placed at a position so as to cover at least a part of the eye region (50). Then, an image representing a scene of the virtual three-dimensional space that is viewed from a certain point of view is generated.