There is provided a method for manufacturing a metallic decorative member without a weld line at low cost including: starting injections of molten molding material into a cavity formed by a set of dies from a plurality of gates provided at the cavity; and stopping respectively the injections of the molten molding material from the plurality of gates at different times so as to make dynamic pressure of the molten molding material injected from one gate smaller than dynamic pressure of the molten molding material injected from the other gate at a position on which heads of flows of the molten molding material injected from the one and the other gates contact each other.