INJECTION MOLDING DEVICE

PROBLEM TO BE SOLVED: To provide a synthetic resin molded article containing a dissimilar for preventing an orientation line formed in the rear of an aperture forming body and the like seen from a gate side to be seen from an outer of the molded article.SOLUTION: A synthetic resin 50 containing a dissimilar 49 is injected from gates 46A and 46B under a condition which a temperature is raised to a prescribed temperature in a range from a temperature of the softening point of the synthetic resin 50 to a temperature which can maintain properties which the synthetic resin 50 has by heating a cavity forming surface of a fixed mold 42 with heating means, and the injection of the synthetic resin 50 by the gate 46B is stopped after the injected synthetic resins 50 meet together and a weld line 47A1 and an orientation line 47A2 of the dissimilar 49 are formed and before pressure keeping which enhances a compression density of the synthetic resin 50 in a cavity 44, and injection of the synthetic resin 50 from the gate 46A is continued for crossing with the orientation line 47A2.