SIDE AIRBAG DEVICE

The present invention is a side airbag device stowed in a side support part of a vehicle seat, which includes: an airbag capable of expanding and deploying toward a front side from the side support part; an inflator that supplies expansion gas to the airbag; and a bracket that retains the airbag in a compressed state. The inflator is secured to an inner side (occupant side) of a side frame of the vehicle seat. Furthermore, the bracket has a rear region that covers a rear side of the airbag in a compressed state and an inner region that extends continuously forward from the rear region between an inner side of the airbag and a seat pad.