To provide a storage dedicated for a slope plate near an entrance in a side of a car in which a slide door opens and closes.

A foldable slope plate 1 is linearly elongated and hanged between an entrance G in a side of a car, where a slide door D opens and closes, and the ground E when in use, and is folded in half and stored upright when not in use. The slope plate 1 is provided such that the slope plate 1 can be slid through an opening B2, provided on an end face B1 of a car body side wall B behind the entrance G in a width direction of the slope plate 1, into and out of the car body side wall B.