A powder sintering lamination molding method which can improve the quality of the molded product without extending the time required for the lamination molding. A powder sintering lamination molding method, including the steps of, irradiating an irradiation region of the sliced layer of a molded product surrounded by an outline profile with a laser to selectively sinter the material powder of the material powder layer within the irradiation region; wherein a cooling period is provided after the laser is irradiated along the first line and before the laser is irradiated along the second line.