Apparatus for producing resin molded article, method for producing resin molded article, and resin molded article

A production apparatus of a two-layer preform including an inner layer preform and an outer layer preform, the apparatus comprising:

• a first injection molding unit configured to injection-mold the inner layer preform with a first resin material;
• a second injection molding unit configured to internally accommodate the inner layer preform that is injection molded in the first injection molding unit and injection-mold the outer layer preform on the outside of the inner layer preform with a second resin material having a lower melting point than the first resin material, and
• a neck mold that molds a neck portion of the preform,
• wherein
• the first injection molding unit has a first injection core mold applied to injection molding of the inner layer preform,
• the second injection molding unit has a second injection core mold applied to injection molding of the inner layer preform and is different from the first injection core mold, and
• an outer layer cavity mold for injection-molding the outer layer preform,
• a bottom surface of the outer layer cavity mold is provided with a protrusion for separating the inner layer preform disposed in the outer layer cavity mold from the bottom surface, and
• the inner layer preform is supported by the neck mold and conveyed to the second injection molding unit.