Vehicle seat

A vehicle seat including: a seatback frame comprising an outer side part frame (113c), provided at an outer side in a width direction of a vehicle body, and an inner side part frame (113d), provided at an inner side in the width direction; the outer side part frame (113c) comprises a side wall (132) facing the outer side in the width direction, and also comprises a rear wall (133) extending from a rear end part of the side wall (132) towards the inner side in the width direction; an outer side load transmission block (121) protruding from the seatback frame towards the outer side in the width direction, and transmitting an impact load inputted from a side of the vehicle body to the seatback frame; and an airbag unit (140) receiving a gaseous pressure of an inflator (142) and deploying a bag body (143) from an end part of an outer side in a width direction of the seatback when an impact is occurred, wherein: the outer side load transmission block (121) and the airbag unit (140) are installed on a surface at the outer side in the width direction of a base plate (141), the base plate being planar; and a surface at the inner side in the width direction of the base plate is overlapped with an outer side surface of the side wall (132).