A three-dimensional shaping method is provided in which a step of forming a powder layer and a step of sintering the powder layer by application of a moving laser beam or a moving electron beam are alternately repeated to perform a multilayer operation within a container, wherein a plurality of equal-width divided regions (2)are set in a multilayer region (4) along a height direction, and then according to certain processes, a number of multilayers N in each of the equal-width divided regions (2) is selected, for selecting a thickness of each multilayer unit in each of the equal-width divided regions (2), and moreover the coordinates of an outer periphery (6) in each of the cross sections (3) of the number N are set.