A method for forming an image of an object includes: illuminating sequentially a surface of the object arranged in the same shooting area using each of N (N is natural number equal to or more than two) polarized light beams, each of which has different property; scanning the surface using the each of N polarized light beams; and outputting the each of N polarized light beams reflected by the surface, the each of N polarized light beams passed-through the object or the each of N polarized light beams scattered by the surface, as an image signal.