An occupant restraining apparatus includes a seat belt with an inflatable portion that can be placed at a high position on a lateral side of an occupant's head without using a large-capacity inflator. A push-up device with first and second levers for pushing up a shoulder belt section is provided on an upper side of a seatback. When the shoulder belt section is inflated, upper arm portions arranged on an upper side of the shoulder belt section are pressed upward, and the respective levers rotate upward about pivotably supporting portions. At this time, lower arm portions of the respective levers arranged on a lower side of the shoulder belt section rise and rotate, and a hanging member is tensed between the lower arm portions. Consequently, the inflated shoulder belt section is pushed upward, and is placed at a high position on the lateral side of the occupant's head.