Abstract: A headrest intended to be mounted to a backrest of a vehicle seat includes a headrest pad with an impact surface for the head of an occupant, a base body which has a cavity and a support by which said headrest is adapted to be secured to a vehicle seat backrest, and an exchangeable gas bag module which is at least partially inserted into said cavity of said base body. The gas bag module forms a unit of a gas bag and a gas generator adapted to inflate the gas bag in the case of restraint and having a module pad which at least partially forms the headrest pad of the headrest.