Seat storing structure for a vehicle and vehicle provided therewith

A third row seat 3 of a vehicle V includes a seat back 32 which can be folded down onto a seat cushion 31, and a headrest 33 which ban be pivoted rearward with respect to the seat back 32. The seat cushion 31 is supported to a floor 4 so as to be pivotable rearward. A recess 41 is formed in the floor 4 of the vehicle V behind the third row seat 3. The recess 41 stores the third row seat 3, with the seat back 32 being folded down, the headrest 33 being pivoted rearward, and the third row seat 3 being pivoted rearward. The headrest 33 is located within a path of the pivotal motion of the seat back 32 and the seat cushion 31, without contributing to the path of the pivotal motion.