To enable goods to smoothly slide on the upper surface of a shelf by eliminating a gap between a rear shelf disposed in the rear of a folding line and a front shelf disposed in front thereof.

Near both ends of a folding line 18, a front shelf 13 and a rear shelf 15 are respectively provided with projecting arms 43, 45 projected toward the outside of the face of a shelf 11. The front shelf 13 and the rear shelf 15 are relatively turned on a turning shaft 47 provided on the projecting arm and folded. The rear end face of the front shelf 13 and the front end face of the rear shelf 15 are butted and folded even in the non-gap state.