A method for an injection molded product having a molten resin containing an aluminum pigment. The injection mold includes resin reservoirs connected to both sides of a cavity, positioned where the molten resin meets as it partly flows therein. The cavity has a design surface of an injection-molded product and both side surfaces continuing from the surface forming the design surface. One of the resin reservoirs is connected to one of the side surfaces and the other resin reservoir is connected to the other side surface, across the position where the molten resin meets. When the molten resin partly flows into the resin reservoirs, flow of the molten resin, which is substantially in parallel from the surface forming the design surface to the resin reservoirs, is generated and aluminum pigment makes an orientation angle of 120° to 140° on the design surface at the position where the molten resin meets.