side airbag that is part of a vehicle occupant restraint system to a vehicle structure 12 put another way fig1 to 7 show exemplary assemblies of an airbag 36 and an attachment device 14 for attaching the airbag to a vehicle structure 12 the airbag being contained in a pouch 38 the vehicle occupant restraint system is located inside a vehicle such that it will be in the vicinity of the head of a vehicle occupant the fastening device 10 according to fig1 is provided with a clamp 14 which comprises a head 16 and a single arm 18 adjoining the head 16 the head 16 is subdivided into a first head portion 20 and a second head portion 22 which may be folded relative to one another by a deformable hinge portion 24 and between which in the folded together state there may be held a flap on the airbag or an airbag flap together with an additional flap on a pouch containing the folded airbag the arm 18 extends from the second head portion 22 which is spaced from the vehicle structure 12 by the first head portion 20 two through holes 26 28 are formed centrally in the head portions 20 22 the two through holes 26 28 are arranged coaxially when the first and second head portions 20 22 are folded together a screw 30 passes through the through holes 26 28 beneath the head of which screw 30 there is positioned a washer 32 the screw 30 is screwed into a socket 34 in the vehicle structure 12.