A technology is provided which is effective for precisely detecting information about a vehicle occupant in a vehicle seat. In one form, an occupant restraint system to be installed in a vehicle is adapted to associate occupant surface profile information relating to a specific body region of a vehicle occupant, which is obtained by a camera for obtaining an image relating to a single view point, with previously stored body information so as to derive body information about the vehicle occupant and varies the occupant restraining mode of an occupant restraint device according to the derived body information.