Abstract: A gas bag module, in particular for head protection in case of a side impact, has an elongated mounting housing (10) having two opposing side walls (12, 14) running spaced apart from each other and a cross-piece (16) connecting the side walls (12, 14), and has a gas bag (20) accommodated in folded state in the mounting housing (10). Further provided is at least one spacer spaced apart from the cross-piece (16), which spacer extends between the side walls (12, 14) and connects them with each other such that a moving apart of the side walls (12, 14) is at least largely avoided when the mounting housing (10) is open and the gas bag (20) unfolds.