Vehicle seat

A vehicle seat, comprising:

• a seat back;
• wherein:
• the seat back comprises:
• a pillar support portion configured to support a head rest pillar;
• a shoulder support portion configured to support shoulders of a seated passenger;
• and
• a bag body configured to expand by injection of fluid to expand the shoulder support potion,
• the bag body includes a right bag body arranged on a right side in the seat back in a seat front view and a left bag body arranged on a left side in the seat back in the seat front view,
• each of the right and left bag bodies includes transverse sides at both end portions in a longitudinal direction thereof, the transverse sides extending in a transverse direction that transverses the longitudinal direction,
• the transverse sides are straight lines inclined with respect to a vertical direction,
• a support body is provided in the seat back,
• the each of the right and left bag bodies comprises fixing target portions at which the each of the right and left bag bodies is fixed to the support body,
• the fixing target portions include tongue-shaped protrusions extending downward along the transverse direction and provided at the both end portions of the each of the right and left bag bodies in the longitudinal direction and at a lower end portion of the each of the right and left bag bodies,
• an upper region of the each of the right and left bag bodies is not fixed, and
• the each of the right and left bag bodies is configured to expand to project toward a seated passenger side by the injection of the fluid.