To prevent the generation of a problem from an aspect of appearance such as a dent even in a thin cement molded object by providing a frame member to the side periphery of a suction pad main body so as to be capable of moving the same along the side surface thereof to certainly suck and demold the cement molded object.

A demolding apparatus 1 is constituted of a suction pad main body 11, a frame member 12 and a pneumatic cylinder 13 and the surface of the suction pad main body 11 is formed into a curved surface having the outer surface shape corresponding to the surface shape of a cement molded product to be sucked and demolded and a large number of suction holes 111 are provided to the surface of the suction pad main body 11 and allowed to communicate with a vacuum suction device by a suction passage 112. The frame member 12 is provided to the periphery on the side of the molded product of the suction pad main body 11 and can be moved up and down along the side surface of the suction pad main body 11 by the forcible driving of the pneumatic cylinder 13 attached to the suction pad main body 11. By this constitution, since the end surface of the cement molded product can be covered with the frame member 12, sufficient suction force is obtained even by small suction force and the cement molded product can be certainly sucked and demolded.