In a vehicle seat, a first slide mechanism disposed on a side wall side of the vehicle compartment is provided with a hinge mechanism having a biasing member that flips up a seat body toward the side wall, and a second slide mechanism disposed on the inner side of the vehicle compartment is provided with a coupling/decoupling switching mechanism for locking or unlocking the mutually coupled second slide mechanism and seat body. The seat body is flipped up by the biasing member when the coupling/decoupling switching mechanism is in the unlocking position. A flip-up position detecting unit is provided for detecting a predetermined flip-up position of the seat body within a slidable range of the seat body, and the coupling/decoupling switching mechanism is switched to the unlocking position when the flip-up position detecting unit detects the flip-up position.