Vehicle seat airbag system and vehicle seat

A vehicle seat airbag system comprising

• an airbag which is caused by the vehicle seat airbag system to inflate and develop within a seat back,
• wherein the airbag is disposed between a seat pad and an outer layer of a rear of the seat back, and the inflation and development of the airbag in the seat back causes the outer layer to expand rearwardly and allows the airbag to elastically support an upper body of a seated person and to elastically receive an impact force which is applied to the rear of the seat back.

A vehicle seat airbag system comprising

• an airbag which is caused by the vehicle seat airbag system to inflate and develop within a seat back, wherein
• the airbag is disposed between a seat pad and a rear board provided in a rear of the seat back, and
• the inflation and development of the airbag in the seat back allows the airbag to elastically support an upper body of a seated person, and causes the rear board to be pushed rearwardly to allow the airbag to elastically receive an impact force which is applied to the rear board.

The vehicle seat airbag system according to claim wherein the rear board is supported on the rear of the seat back swingably in a direction away from the rear of the seat back.

A vehicle seat comprising:

• a seat back frame, an elastic installation supporting member installed in the seat back frame, and an airbag within a seat back, the vehicle seat causing the airbag to inflate and develop within the seat back, wherein
• an inflator is attached to the seat back frame, and
• the inflation and development of the airbag in the seat back due to an operation of the inflator allows the airbag to elastically support an upper body of a seated person and to elastically receive an impact force which is applied to a rear of the seat back.