1. An image sensing apparatus which performs a plurality of times of image sensing on a subject, superpose-combines a plurality of subject images obtained by the image sensing into one subject image, comprising: an image sensing unit that converts a subject optical image into an electric signal; an optical unit that changes a view angle; and a change unit that changes a position of said optical unit so as to widen the view angle by a predetermined amount, prior to said plurality of times of image sensing on the subject.