To secure the well-ordered display condition so as to improve the selling efficiency by making the surface having a low friction, fixing rail members which are elongated and circular in section to the upper surface of the base plate along the inclining direction, and bringing the base of a battery pack into line contact with the upper surfaces of the rail members.

In a showcase 20, the internal space of the showcase 20 is divided in the lateral direction by four partition plates 22 to form three article loading spaces 23 elongated in the longitudinal direction. Each article loading space 23 is so constructed that three rail member fixing pieces 24 are fitted at designated spaces in the longitudinal direction on the upper surface of a base plate 21, and each rail member fixing piece 24 is provided with a notch part 24 having an 8-shaped section formed in the central part thereof. Two parallel rail members 25 fitted to the notch parts 24a are removably installed on the upper surface of the base plate 21. The rail members 25 are formed as a round bar out of a fluororesin having a low frictional resistance value.