Abstract: An inflator for supplying a gas into an airbag body in a collision of a vehicle is mounted on a peripheral edge portion of a roof of a vehicle body through a bracket, the bracket is formed having a long plate shape along the peripheral edge portion of the roof, a fixing portion of the bracket on which the inflator is fixed and a mounting portion of the bracket to be mounted on the peripheral edge portion of the roof are juxtaposed in a longitudinal direction of the bracket, and a fixed surface of the fixing portion is inclined so as to be located closer to a cabin exterior as it goes closer to the upper side with respect to a mounted surface of the mounting portion.