Side impact protection airbag system

A side impact protection airbag system comprising:

• an inflator having a substantially cylindrical gas ejecting part and adapted to eject an inflation gas from a plurality of gas ejecting holes on an outer circumferential surface of the gas ejecting part in response to an impact applied to a vehicle from an external direction;
• a retainer having a tubular wall part for holding the inflator to cover the inflator from an outside thereof and an opening which is provided in a position on the wall part which lies in a vicinity of the gas ejecting part so as to permit the passage of at least part of the inflation gas from the gas ejecting part;
• and
• an airbag whose interior space is divided into at least a first chamber and a second chamber by a dividing part and which is fixed to the vehicle at one end portion thereof as a fixing end portion;
• the gas ejecting part and the opening being provided between the fixing end portion of the airbag and an end portion of the dividing part which lies on a side facing the fixing end portion or in the vicinity thereof, so that the airbag is made to be inflated and deployed towards the vicinity of an outer side of an occupant in a vehicle seat by the inflation gas which is supplied from the retainer into the respective chambers,
• wherein a circumferential portion on the wall part which is separate from the portion where the opening is formed is provided between the gas ejecting part and the end portion of the dividing part which lies on the side facing the fixing end portion as an interruption wall for interrupting the passage of the inflation gas ejected from the gas ejecting holes to the dividing part side.