Patent ID: 7018576

Claim:
A manufacturing method for a resin part of a vehicular lamp, said resin part having a reflective surface on at least one portion thereof, said method comprising: providing a molding die having a cavity for molding a body of said resin part, said molding die comprising a heat insulating layer formed on portions of a surface of said cavity corresponding to said reflective surface of said resin part; injecting molten resin into said cavity of said molding die; removing the molded body of said resin part from said molding die; and applying a metallic vapor deposition coating directly to a surface of said molded body of said resin part molded in contact with said heat insulating layer to form the reflective surface. wherein said cavity surface on which said heat insulating layer is formed comprises a portion of a nested die to be fitted into a mold part; and further comprising forming a peeling layer on said heat insulating layer.