REAR SEAT SIDE AIRBAG DEVICE

A rear seat side airbag device that includes: an inflator that generates gas in the event of a vehicle collision; and a side airbag that is supplied with gas from the inflator from a position in a vehicle cabin side portion that corresponds to a rear seat, and that is inflated and deployed towards a portion on an outer side in a vehicle width direction of a vehicle occupant in a case in which the vehicle occupant is sitting in the rear seat.