PROBLEM TO BE SOLVED: To provide an image forming method, by which positional correlations of pieces of image information of an article on an optical axis direction are made.SOLUTION: On the basis of tomographic image information of the information of a two-dimensional image at a region, in which first tomographic image information of the information of a two-dimensional image of a substance to be examined at a first position, and information of a two-dimensional image at a region, in which second tomographic image information of the information of a two-dimensional image of said substance to be examined at a second position different in depth direction from the first position, the positional registration of the first and second pieces of the tomographic image information is executed to reconstitute a tomographic image on the basis of the information of the first and second pieces of tomographic images.
