This invention the gas formation device for the safe system regards (1). As for this device, at least, the 1st chamber (10) it being in, the principal pyrotechnics chemical compound which is ignited one which has the reinforcement explosive ignition device (11) by at least and, the 2nd chamber (20) including the explosive which with the auxiliary pyrotechnics chemical compound which in was formed, the 1st territory which is close to the 1st chamber among that 2nd chambers (30) the hole which discharges the gas (17) being provided in the margin of position, the 2nd territory (40) auxiliary pyrotechnics chemical compound is accommodated in position. The case where the gas passes the expedient which forms obstacle (70), the 1st territory in the 2nd chamber and being installed in position between the 2nd territory, as for that expedient which forms obstacle, while abbreviation non restriction characteristic of the space of interaction maintaining, when it possesses sufficient transmissivity, the central part (81; 181) the gas is made to pass freely, but the case where the gas passes the margin it has become obstacle.
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