To prevent a show case form being withdrawn and dropped together with rental merchandise and from falling by providing a show implement with suction cup for supporting its home position.

The show implement A is constituted by holding the shape of a square cylindrical body 3 made of a synthetic resin sheet or cardboard, etc., by means of a cap wall formed by folding the opposite flank walls on the right and left of circumferential opposite four side walls 4 of the square cylindrical body 3 respectively into the square cylinder 3 continuously from the upper and lower edges thereof and alternately fitting and meshing comb tooth-shaped notches 5 disposed at the free end edge with each other and a bottom cap 7. The show implement A is provided with the suction cup 11 for supporting its home position. The show implement A is held mounted on a shelf (atop a shelf plate or the rear wall surface of the shelf) by attracting the suction cup 11 thereto when the show implement A is interposed between the classifications of the merchandise. As a result, such things that the show implement A is withdrawn and dropped together with the merchandise at the time of withdrawing the merchandise and that the show implement A is fallen by the space formed when the merchandise is withdraw does not arise any more.