To provide a sucker in which the ejection of air is not hindered by a force for pressing a sucker main body to a wall surface, a large fixing force can be obtained by increasing vacuum by preventing air leaking into the sucker main body by closing a check valve automatically after the ejection of the air, and which can simply be removed from the wall surface with breaking of the vacuum of the sucker by opening the check valve.

The sucker 1 is provided with an ejection hole 3 with the check valve at the prescribed place of the sucker main body 2.