REAR-SEAT AIRBAG

A rear-seat airbag configured to expand and deploy inward of a vehicle from a door trim beside a rear seat includes a first expansion air chamber and a second expansion air chamber. The first expansion air chamber is configured to expand and deploy to a space facing leg parts of a passenger in the rear seat that are above knees of the passenger. The second expansion air chamber is configured to expand and deploy to a space between the first expansion air chamber and the passenger in the rear seat.