To provide a seat for a vehicle provided with an auxiliary wheel to be folded and taken out without performing a special operation by eliminating a problem wherein the vehicle is damaged because folding and take-out operations of the auxiliary wheel are forgotten in a conventional seat for the vehicle, in the seat for the vehicle enabling even an occupant such as an aged person to easily get in/out the vehicle, separating a seat device from a lift up device to be independently used as a wheel chair and having the auxiliary wheel for preventing falling backward in this case.

An auxiliary leg 201 provided with the auxiliary wheel 200 on one end side is rotatably supported on a rear wheel stay 71. A guide roller 203 on the other end side of the auxiliary leg 201 is rolled on a guide surface 210a of a guide block 210 provided on a seat frame 20. The guide roller 203 is displaced for a rotary axis 202 of the auxiliary leg 201 according to rotation of the rear wheel stay 71. The auxiliary leg 201 and the auxiliary wheel 200 are folded and taken out by interlocking with folding and take-out operations of the rear wheel 70.