A mold provided with: rotating members 80 that are installed so as to be capable of rotating with respect to the main mold body centered on a bearing 81 and that have a protruding grip-forming part, which is for pressing a portion of an expanding preform during blow-molding, and a first engaging part formed between the bearing 81 and the grip-forming part; and linear actuators 90 that are provided with a pressing part 93, which has a second engaging part that is engaged with a first engaging part, and that press and rotate the rotating members 80 by the forward movement of the pressing parts 90 with respect to a cavity 70a to move the grip-forming parts from a standby position to a pressing position.