Seat device for a vehicle and vehicle provided therewith

The seat device, disposed on the floor panel 4 in the cabin 2 with the instrument panel 17, comprises the driver seat 18, the assistant seat 19 and the rear seat 22, wherein the assistant seat 19 is foldable and movable forward close to the instrument panel 17 to be located in the stored position alpha where the length of the folded seat 19 is made short, the rear seat 22 is foldable and movable forward to be located in the stored position beta , and the assistant seat 19 in the stored position alpha and the rear seat 22 in the stored position beta provide the substantially continuous storage space 70 which is formed by back faces of respective seat backs 25 and 28 of the assistant seat 19 and the rear seat 22. Thus, both the large space and the roomy cabin for passengers can be improved.