PURPOSE: To make loading and unloading easy, by providing a sliding member on which a load can be placed.

CONSTITUTION: When a load is to be placed on a sliding member 2, a handle is, for example, is pulled so that a rotatable roller 61 is slid along one end 1b that is slant. In this case, a rotatable roller 31 is rotated to facilitate the sliding. Further, the rotatable roller 61 is slid along a second guide horizontal section to cause the rotatable roller 31 to be forced against a stopper 27. As a result, a swingable member 8 in the form of a lever is started to rotate about one end 8a thereof. Then the rotatable roller 61 is further slid to be abutted against a stopper 43, and thus the sliding member 2 is rotated about the rotatable roller 61. Subsequently, one end 2b of the sliding member 2 can be located at a position substantially lower than the roof of the car (C).