Proposed is an airbag for a vehicle, the airbag includes a cushion provided on a roof of the vehicle and deployed when gas is injected, first binding parts each formed in a structure protruding from the cushion and provided with a hole configured to bind with a bracket, first fixing parts each provided on the cushion and configured to wrap and fix the cushion, a bracket configured to support the cushion in combination with the cushion, and second binding parts each formed in a structure protruding from the bracket and provided with a hook to restrain the bracket and the cushion through the hole of a corresponding one of the first binding parts, so that the bracket supports the cushion.