Abstract: A vehicle seat equipped with a side airbag device includes: an inflator disposed on an outer side in a vehicle width direction relative to a side frame; an inner chamber housed inside the side part, and is configured to inflate and deploy toward a part of an occupant on the outer side in the vehicle width direction upon receiving supply of a gas from the inflator; an outer chamber housed inside the side part, and is configured to inflate and deploy toward the outer side in the vehicle width direction and a vehicle front side relative to the inner chamber upon receiving supply of the gas; and a diffuser housed inside the side part and configured to supply the gas into the inner chamber from a first supply port formed in a peripheral wall of the diffuser when the inflator is activated.

Abstract: There is provided a side airbag device including: a first side airbag being provided inside a side section at a seat width direction outer side of a seatback and inflated and deployed at a side of an occupant seated in a seat; a second side airbag being arranged at a seat width direction inner side of the first side airbag so as to inflate and deploy between the first side airbag and the occupant; a communication section that places the first side airbag and the second side airbag in communication with each other; and a gas generation device, the gas generation device being provided at the communication section, and including a first gas emission section to supply gas into the first side airbag, and a second gas emission section that is separate from the first gas emission section to supply gas into the second side airbag.

Abstract: A vehicle seat equipped with a side airbag device includes: an inflator disposed on an outer side in a vehicle width direction relative to a side frame; an inner chamber housed inside the side part, and is configured to inflate and deploy toward a part of an occupant on the outer side in the vehicle width direction upon receiving supply of a gas from the inflator; an outer chamber housed inside the side part, and is configured to inflate and deploy toward the outer side in the vehicle width direction and a vehicle front side relative to the inner chamber upon receiving supply of the gas; and a diffuser housed inside the side part and configured to supply the gas into the inner chamber from a first supply port formed in a peripheral wall of the diffuser when the inflator is activated.

Abstract: There is provided a side airbag device including: a first side airbag being provided inside a side section at a seat width direction outer side of a seatback and inflated and deployed at a side of an occupant seated in a seat; a second side airbag being arranged at a seat width direction inner side of the first side airbag so as to inflate and deploy between the first side airbag and the occupant; a communication section that places the first side airbag and the second side airbag in communication with each other; and a gas generation device, the gas generation device being provided at the communication section, and including a first gas emission section to supply gas into the first side airbag, and a second gas emission section that is separate from the first gas emission section to supply gas into the second side airbag.