The present invention includes: using a forming mold that includes a fixed mold and a movable mold that moves along a parting surface with respect to the fixed mold; moving the movable mold along the parting surface, thereby pressing and holding a sintered part between the movable mold and the fixed mold; forming a cavity, using the forming mold, around a region excluding portions of the sintered part that contacts the fixed mold and the movable mold; filling the cavity with a molten material that becomes an exterior part; and integrating the sintered part and the exterior part by insert molding.
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