An occupant restraint device including: right and left airbags stored inside right and left sides of a seat back of a vehicle seat, respectively; right and left tension cloths connected to outer surfaces of the right and left airbags, respectively; and a lower tension cloth disposed inside a seat cushion of a vehicle seat, the lower tension cloth being continuously connected between lower parts of the right and left tension cloths. The lower tension cloth is movable in right and left directions with respect to an occupant sitting in the vehicle seat. When the right and left airbags are expanded and deployed, the right tension cloth, the left tension cloth, and the lower tension cloth are configured to push the expanded and deployed right and left airbags toward the occupant.