A molding device for manufacturing a molded product having an inner space bent in a circular arc shape, the molding device comprising: a set of molds (30, 40) which is joinable to and separable from each other, the set of molds (30, 40) being capable of forming a cavity having a shape corresponding to an outer shape of the molded product in a joined state at the time of molding; a core which has an outer shape corresponding to an inner shape of the molded product, and is used in a state where the core is arranged in the inside of the cavity which the set of molds forms at the time of molding; and an ejector plate which has a core through hole through which the core passes, and ejects the molded product formed around the core along the circular arc shape in a separated state where the set of molds (30, 40) is separated from each other, wherein the ejector plate is rotatable about a rotary shaft perpendicular to a plane along the circular arc shape, and the molding device further includes an ejector plate rotating pin which is extensible and retractable in the direction perpendicular to the rotary shaft, and rotates the ejector plate by pushing, characterized in that a refrigerant flow path is formed in the inside of the ejector plate; the molding device further includes an ejector plate pull-back pin which is connected to the ejector plate by a connection portion and is configured to return the ejector plate to a position before molding by rotating the ejector plate by pulling after the ejector plate rotating pin rotates the ejector plate by pushing; and the connection portion is a circular columnar-shaped pin which projects from the ejector plate, and wherein a hole corresponding to the connection portion is formed in an end portion of the ejector plate pull-back pin, the connection portion passing through the hole. a set of molds (30, 40) which is joinable to and separable from each other, the set of molds (30, 40) being capable of forming a cavity having a shape corresponding to an outer shape of the molded product in a joined state at the time of molding; a core which has an outer shape corresponding to an inner shape of the molded product, and is used in a state where the core is arranged in the inside of the cavity which the set of molds forms at the time of molding; and an ejector plate which has a core through hole through which the core passes, and ejects the molded product formed around the core along the circular arc shape in a separated state where the set of molds (30, 40) is separated from each other, wherein the ejector plate is rotatable about a rotary shaft perpendicular to a plane along the circular arc shape, and the molding device further includes an ejector plate rotating pin which is extensible and retractable in the direction perpendicular to the rotary shaft, and rotates the ejector plate by pushing, characterized in that a refrigerant flow path is formed in the inside of the ejector plate; the molding device further includes an ejector plate pull-back pin which is connected to the ejector plate by a connection portion and is configured to return the ejector plate to a position before molding by rotating the ejector plate by pulling after the ejector plate rotating pin rotates the ejector plate by pushing; and the connection portion is a circular columnar-shaped pin which projects from the ejector plate, and wherein a hole corresponding to the connection portion is formed in an end portion of the ejector plate pull-back pin, the connection portion passing through the hole.