Abstract: The present invention protects both upper part and lower part of the body of a passenger when an airbag expands in a collision and prevents secondary damage to a baby/infant by appropriately controlling expansion pressure of the cushion on the basis of characteristics of the their bodies. The present invention includes: a diffuser that is disposed in a crush pad and has gas supply holes, gas discharge holes, and an inflator; expansion pressure control member that is movably disposed with respect to diffuser and has at least an opening fluidly-communicating with gas supply holes and a closing portion opening or closing gas discharge holes; and a guide member connected with expansion pressure control member, guides cushion in a predetermined direction, and controls the opening or closing of gas discharge holes by moving expansion pressure control member with respect to diffuser using an internal or external force applied while cushion expands.

Abstract: The present invention protects both upper part and lower part of the body of a passenger when an airbag expands in a collision and prevents secondary damage to a baby/infant by appropriately controlling expansion pressure of the cushion on the basis of characteristics of the their bodies. The present invention includes: a diffuser that is disposed in a crush pad and has gas supply holes, gas discharge holes, and an inflator; expansion pressure control member that is movably disposed with respect to diffuser and has at least an opening fluidly-communicating with gas supply holes and a closing portion opening or closing gas discharge holes; and a guide member connected with expansion pressure control member, guides cushion in a predetermined direction, and controls the opening or closing of gas discharge holes by moving expansion pressure control member with respect to diffuser using an internal or external force applied while cushion expands.