REAR SIDE AIRBAG DEVICE

Provided is a rear side airbag device that can be mounted with ease. A rear side airbag device is located between a vehicle body and a rear seat, and includes an airbag, an inflator configured to supply gas into the airbag, and a mounting bracket to which the inflator is fixed. The mounting bracket includes an inflator mount portion to which the inflator is fixed, and a first anchor portion and a second anchor portion that are to be fixed to other members, whereas the first anchor portion and the second anchor portion are located on a laterally inner side with respect to the inflator mount portion.