To eliminate external appearance fault such as flow mark, weld line or hesitation mar with excellent weather resistance, wear resistance, heating aging characteristics and satisfactory dimensional accuracy by incorporating a skin layer having a specified maximum thickness on a surface layer of an outer surface.

The polyacetal resin molding has a thickness of a skin layer of an outer surface of 50 μm or less. Used resin is polyacetal resin containing polyacetal resin as a main component, and single polyacetal or a mixture of the polyacetal containing 50 wt.% of more of polyacetal resin and other resin. And, in the molding having a hollow part therein, the part is not formed of a cavity (void) or foaming agent but preferably obtained by a hollow injection molding method. As pressurized fluid used for the hollow injection molding, pressurized gas is used.