Abstract: A hat ironing machine having a multiple cam shaft which is actuated by a driving member to push a position controlling frame so as to cause two molding heads to jut out to facilitate the holding of a hat to be pressed. Two support bodies which are linked with both ends of the multiple cam shaft are at work to actuate two brim-holding structures to move toward the molding heads to hold the brim of the hat. The steam is then released through the steam holes of the molding heads onto the hat being pressed. As soon as the pressing of the hat is completed, the multiple cam shaft is once again actuated by the motor such that the brim-holding structures release the brim of the hat so as to enable the machine operator to remove the hat from the machine.