A method for producing a three-dimensional shaped product in which layering is established based on sequential repetition of steps of molding a powder layer by dispersion of powder while sliding a squeegee along a straight line and sintering the powder layer using a laser beam or an electron beam, wherein the sintering for each powder layer is targeted to a gas-permeable lattice region and to an outer frame region which is connected to the gas-permeable lattice region, the outer frame region is disposed around the entire periphery of the gas-permeable lattice region, and for each of the powder layers targeted for the lattice region, a sintered layer is molded along one direction by parallel scanning of the laser beam or the electron beam having a predetermined spot diameter several times in the one direction at a predetermined interval with the mutually facing outer frame regions bonded, after which a sintered layer is molded in an other direction again by parallel scanning of the laser beam or the electron beam having the predetermined spot diameter several times at the predetermined interval with the mutually facing outer frame regions bonded, in the other direction that crosses with the one direction within each of the same powder layers, wherein the sintered layer along the one direction and the sintered layer along the other direction are crossing, and the sintered layer along the one direction and the sintered layer along the other direction are bonded in a superimposed state in a crossed region, while in the outer frame region, a continuous sintered layer is molded by scanning the laser beam or the electron beam having the predetermined spot diameter over the outer frame region that is surrounded by an inner line and an outer line, the inner line and the outer line having identical center locations and either a regular polygonal shape or a curved shape, wherein the laser beam or the electron beam is scanned on the outer frame region in an early stage, or a later stage, or an intermediate stage of molding for the sintered layers in the lattice region, wherein the outer frame region is separated by a predetermined width and divided by parallel lines selected in specific directions, and the laser beam or the electron beam is scanned in a direction perpendicular to the direction of the parallel lines dividing the outer frame region, wherein the direction of the parallel lines is selected to form the maximum distance in the outer frame region whose boundary is defined by the inner line and the outer line, for the predetermined width, wherein the sliding direction of the squeegee is diagonal with respect to both the one direction and the other direction for carrying out the scanning in the lattice region. wherein the laser beam or the electron beam is scanned on the outer frame region in an early stage, or a later stage, or an intermediate stage of molding for the sintered layers in the lattice region, wherein the outer frame region is separated by a predetermined width and divided by parallel lines selected in specific directions, and the laser beam or the electron beam is scanned in a direction perpendicular to the direction of the parallel lines dividing the outer frame region, wherein the direction of the parallel lines is selected to form the maximum distance in the outer frame region whose boundary is defined by the inner line and the outer line, for the predetermined width, wherein the sliding direction of the squeegee is diagonal with respect to both the one direction and the other direction for carrying out the scanning in the lattice region.