A powder bed fusion apparatus has an energy beam emitting section for outputting an energy beam, a thin layer forming section for forming a thin layer of a powder material, preliminary heating means for pre-heating the thin layer of the powder material, and control means for controlling modeling, wherein the control means performs forming the thin layer of the powder material, pre-heating the thin layer of the powder material, and modeling based on slice data, in which irradiation of the energy beam is started from the central region of the thin layer, and sequentially moved to a peripheral region of the thin layer.