PURPOSE: To make it possible to obtain a resin molding, the color tone of the terminal side of which is kept at the desired tone, by a method wherein material different in color is located at the central side of the resin molding from the at its peripheral part and further the direction of resin flow at the terminal part is regulated.

CONSTITUTION: Excluding the opening position of a gate 15, through which synthetic resin E is injected in the cavity space 16 of molds 13a and 13b, an extension space 18, which extends outwards from the peripheral surface part of the cavity space 16 through a communicating hole 17. From the gate 15 of the molds 13a and 13b into the cavity space 16, the synthetic resin E containing material P, which has the color different from that of the light- colored synthetic resin E And is surrounded by the synthetic resin E so as to locate at the central side, is injected and filled. At the same time, the tip part of resin flow containing the material P different in color is run out of the cavity space 16 through the communicating hole 17 in the extension space 18 so as to form an extension part (e) integral with a molded article main body. After that, the extension part (e) is removed from the molding main body.