An airbag assembly, which is capable of facilitating a deployment of a deployment part when a passenger seat airbag is deployed, and preventing a damage of a hinge part includes: a deployment part turned and opened when an airbag disposed inside a crash pad is deployed; a hinge part fixing the deployment part to the crash pad; and a plurality of hinge protection structures formed at one end of thehinge part in order to set a deployment direction of the airbag. Each of the plurality of hinge protection structures may include a load pass hole formed at the opposite surface of a surface facing the airbag, and distributes stress applied to the hinge part when the airbag is deployed.