An occupant restraint system includes an airbag and an inflator. A gas supply pipe extending from the inflator is inserted into the interior of the airbag and immovably fixed in a manner in which the gas supply pipe is clamped from above and below by a pipe support formed in the airbag from a part of stitching defining a plurality of cells. The gas supply pipe can thus be fixed without employing any special fixing member, thereby reliably preventing blockage of the gas nozzle that would cause interference with smooth issuing of the gas and preventing damage to a base fabric of the airbag by the heat and pressure of the gas.