The invention describes a mounting device (10) for a folded side airbag comprising a receiving portion (12) encompassing the folded part of the airbag (46) in a substantially ring-shaped manner which receiving portion can adopt an inserting state for inserting the airbag (40) and a mounted state in which the mounting device (10) retains the airbag (40) by encompassing the same. The mounting device (10) further includes a flange portion (14) for arranging the mounting device (10) on the car body side which comprises a base plate (26) and a fixing plate (28) being coupled to each other in the mounted state. Moreover, the mounting device (10) includes a partition panel (20) for separating at least one outer layer (44) of the airbag package (46) from the residual airbag package (46) and for clamping the at least one outer layer (44) which between an outer wall (16) of the receiving portion (12) and the separating wall (20) projects into the receiving area (18). Furthermore an airbag module (38) comprising a mounting device (10) is suggested.