Method and device for manufacturing resin-made container

An apparatus for manufacturing a resin container, comprising:

• a first injection-molding unit configured to injection-mold a bottomed cylindrical resin intermediate molded body;
• a second injection-molding unit configured to injection-mold a resin material having translucency on an outer side of the intermediate molded body to manufacture a multilayered preform having a resin layer laminated on an outer peripheral side of the intermediate molded body;
• and
• a blow-molding unit configured to blow-mold the preform to manufacture a resin container having a thick portion,
• wherein, an inner layer and an outer layer of the preform are translucent respectively,
• the second injection-molding unit inserts an injection core mold inside the intermediate molding body,
• in the first injection-molding unit and the second injection-molding unit, a neck portion of the intermediate molded body and a neck portion of the preform are held and transported by a common mold, and
• the apparatus further comprises a conveyance mechanism that comprises the common mold, wherein the apparatus is configured such that even when a mold of the first injection-molding unit is opened, the common mold of the conveyance mechanism is not opened.