To firmly fix and mount a heavy matter while utilizing the advantage possessed by an easily attachable and detachable sucker in the mounting of equipment onto a smooth surface, prevent the burglar thereof, and make the sucker usable outdoor, thereby solving the disadvantage possessed by the sucker.

A sucker 5 and a nut 4 are integrated together to form a sucker with nut, and in order to enhance the mounting rigidity and also prevent the sucker from being directly removed from the outside, a stabilizer 2 having a leg made into a skirt-like form for covering the whole sucker and a soft rubber stuck to the end surface of the leg contacting a smooth surface is used. The inside of the leg of the stabilizer 2 is recessed so as to fit the nut 4, and the stabilizer 2 is mounted on the nut 4 part of the sucker 5 by a screw.