1. An image sensing apparatus comprising: a solid-state electronic image sensing device for sensing the image of a subject and outputting image data representing the image of the subject; an exposure control device for adjusting amount of exposure of said solid-state electronic image sensing device; a target image detecting device for detecting a prescribed target-image portion from within the image of the subject represented by the image data that is output from said solid-state electronic image sensing device; an AE target area deciding device for deciding an AE target area, which is for obtaining the brightness of the target-image portion, based upon the target-image portion detected by said target image detecting device; an exposure-amount deciding device for deciding amount of exposure of said solid-state electronic image sensing device based upon image data representing an image within the AE target area decided by said AE target area deciding device; and a control device for controlling said exposure control device so as to obtain the amount of exposure decided by said exposure-amount deciding device.