Seat structure for a vehicle and vehicle provided therewith

A second row (2) seat is guided by a vehicle-longitudinal-direction sliding mechanism (20) and a vehicle-width-direction siding mechanism (21) supported on the vehicle-longitudinal-direction sliding mechanism (20). The vehicle-width-direction sliding mechanism (21) is configured such that a length thereof is set within a width of a recess portion (27) formed at the bottom face of a seat cushion (2C) so as to allow the vehicle-width-direction sliding mechanism (21) to be placed within the recess portion (27) when the seat cushion (2C) has been moved forward and downward by a moving mechanism. Accordingly, a load floor formed by a back face of a seat back (2B) according to a forward movement of the seat back (2B) with its lower and horizontal position can be obtained.