To ensure safety of passenger by preventing floating of a seat at collision, in a vehicle seat provided with turning mechanism.

The vehicle seat is provided with the turning mechanism comprising: a lower part constituting body 1 provided with a turntable 5 and a guide roller 6 arranged inside the turntable in a vertical axis direction; and an upper movable constituting body 2 provided with a guide rail 11 which has a guide groove 11a fitted to the guide roller 6 and is rotatably mounted to the turntable 5. In the vehicle seat, a stopper member 14 provided with flanges 15a and 15b is fixed to the upper movable constituting body 2 side, and a receiving member 12 engaged with the flanges 15a and 15b in a forward direction of the seat to restrict an upward movement of the seat is fixed at the lower constituting body 1 side.