To provide a removing device for tire molding drum which ensures the safe and secure replacement of a molding drum for required size, a bladder on the body side of a molding machine or the like, efficiently in a short time, when such a replacement is carried out.

This removing device for tire molding drum is of such a construction that a molding drum 5 is removable from a hollow main shaft 2 of the molding machine through a removing mechanism 20 by bringing a fitting flange 17 formed at the end part of a drum shaft 6 into contact with a mountable flange 2a formed at the shaft end of the main shaft 2 of the molding machine. The removing mechanism 20 is constituted of a plurality of switching hook arms 22 with engaging clicks 21 which engage with the conical concavity of the fitting flange 17, a split tapering member 23 which slides into contact with the inclined outer peripheral face 22a of each of the hook arm 22 and always urges the engaging click 21 in the engagement direction and a hook arm 22 disengaging means 24 which draws the tapering member 23 in the disengagement direction.