An occupant restraining device is disclosed, in which stress applied to a stitch section of a sewn bag can be dispersed at the time of inflation of the bag. In one form, the device includes an inflatable bag disposed above a seat pan with the bag being capable of pushing a front portion of a seat cushion from below, and an inflator (gas generator) for inflating the bag. Weave directions of panels are biased with respect to longitudinal stitch lines by about 45°. Accordingly, stress applied to a stitch section by the lines can be dispersed at the time of inflation of the bag.