VEHICLE SEAT

A vehicle seat that can give good deployment of a side airbag in a configuration in which a side support mechanism and side airbag are installed in a seat back. The vehicle seat 10 is provided with: paddles 30 configuring frames of side supports 18 of a seat back 14; a side support adjusting mechanism 22 including a paddle drive mechanism 34 receiving adjustment force and displacing the paddles 30 in a seat width direction; a side airbag 24 provided in a folded state at a seat width direction edge portion inside the seat back 14, receiving a gas supply and deploying forwards in the seat front-rear direction while inflating; and a frame moving structure for displacing the paddle 30 inward in the seat width direction by deployment pressure of the side airbag 24. The frame moving structure is a structure in which the paddle drive mechanism 34, for driving the paddle 30 inward in the seat width direction, allows relative displacement of the paddle 30 in the seat width direction.