The inflator (10) comprises a rupture cap (20) comprising a bottom (21) and a sleeve-like side wall (22), the bottom (21) and the side wall (22) defining an igniter compartment ( 23), and the cap (20), in the inactive mode, being pressurized on the outer peripheral side with compressed gas having a filling pressure (PF) which, at a maximum operating temperature of the inflator (10), has a pressure maximum filling (PFmax), and in which the cap (20) can be destroyed by burst pressure on the compartment side during operation. A transition portion (24) is formed from the side wall (22) of the cap (20) to the bottom (21) so that the compartment side burst pressure necessary to destroy the cap (20) is less than the sum of the maximum filling pressure (PFmax) and the filling pressure (PF).
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