To enlarge a free degree in the attitude of a wheelchair which lies alongside a vehicle by respectively forming bending parts which are bent and extended almost at right angles against a board longitudinal direction so as to be mutually bent and extended to the same sides in both end parts in the longitudinal direction.

Bending parts 7 and 7 of a board 1 are placed over in an attitude so that they face to the sides of a wheelchair 2 and the seat backs 14 and 15 of a seat 5, and in a form that one of the bending parts 7 is placed on the seat surface 3 of the wheelchair 2 and the other end part side is placed on the seat surface 6 of the seat 5 in an automobile 4. Further, a fixing belt 11 is previously passed through a hole part 10 which is positioned at the wheelchair side in the end part of the chair side to be wound around the seat surface 3 of the wheelchair 2 and fixed in the state that the board is placed over. In the state that the board 1 is placed over in such a way, a user moves from the seat part of the wheelchair 2 to the seat 5 or from the seat 5 to the seat part of the wheelchair while properly sliding on the board.