Abstract: A front seat assembly for a vehicle configured to sit three passengers includes a driver seat and an assistant seat spaced apart by a predetermined distance. Also included is a middle seat, installed between the driver seat and the assistant seat, wherein a seat cushion is foldably installed in the seat cushion of the assistant seat and a seatback is foldably installed in a rear portion of the seat cushion of the middle seat. Furthermore, an armrest is protruded behind the seatback of the middle seat so as to allow the driver to put the driver's arm thereon when the seatback is in a folded position.