A passive seatbelt system wherein a webbing is connected to a webbing guide movably received in a guide rail laid in or on a vehicle and the webbing guide is moved by a thick wall tape to cause the webbing to approach or recede from the body of an occupant of the vehicle. A tape casing for receiving the tail end portion of the thick wall tape is provided at a position adjacent to driving means for driving the thick wall tape in a panel of the vehicle.
