After molding a hollow article 10 in a state where the inner surface of a neck section 11 comprising an internal thread is held by a neck mold 52, an ejection rod 81 is inserted inside the hollow article 10 to be engaged with the inner surface of the hollow article 10, and by rotating the ejection rod 81 together with the hollow article 10, the hollow article 10 is released from the neck mold 52.