An occupant restraining device capable of accurately adjusting the position of an airbag that expands and deploys. An occupant restraining device comprising an airbag installed in a seatback frame, provided with bands that pulls said airbag, which expands and deploys, to the center of said frame; said bands being in a position where the first portion, a twisting portion, is attached to the upper part of said frame and is twisted in a width direction relative to the second portion.