Manufacturing device and manufacturing method for synthetic resin hollow molded body

A manufacturing device for a synthetic resin hollow molded body, comprising:

• a first die and a second die which mold a first split assembly member, a second split assembly member and a third split assembly member which are molded by a first injection and each of which has a contact portion that is jointed with a corresponding contact portion by a second injection;
• an ejecting mechanism which moves at least one of the first split assembly member, the second split assembly member, and the third split assembly member in a die opening/closing direction such that a phase of the member is made different from phases of the other members in the die opening/closing direction while the first die and the second die are open;
• a rotating mechanism which rotates at least one of the first split assembly member, the second split assembly member, and the third split assembly member around a shaft center in the die opening/closing direction while the first die and the second die are open;
• and
• a sliding mechanism which slides at least one of the first split assembly member, the second split assembly member, and the third split assembly member in a direction perpendicular to the die opening/closing direction while the first die and the second die are open, wherein the first split assembly member, the second split assembly member, and the third split assembly member are made to face one another in the die opening/closing direction by the ejecting mechanism, the rotating mechanism, and the sliding mechanism.