Abstract: In a vehicle seat having an airbag module placed in the seatback thereof, the load that may be applied to the back side of the seatback is prevented from being applied to the airbag module. The vehicle seat (1, 300, 400) comprise a seatback frame (19) including a pair of side members (26, 301) extending vertically along either side thereof and providing a structural framework of a seatback, a plate member (20, 402) positioned behind the seatback frame and including an extension (32, 410) extending in an outboard direction from the side member located on an outboard side of the seatback frame, a mounting member connected to the outboard side member, and an airbag module (23) positioned on a front side of the extension and connected to the outboard side member via the mounting member, a clearance (S) being defined between the airbag module and the extension.