An emergency locking retractor comprises a lock member capable of assuming a position in which it engages an engaging portion integral with a webbing take-up shaft to lock the rotation of the shaft in webbing draw-out direction and a position in which it does not engage the engaging portion. A speed change sensing member is adapted, when it senses a greater speed change of a vehicle than a predetermined value, to shift from a first condition to a second condition and thereby move the lock member to the engaging position. The retractor also includes a switch-actuated electrical system for moving the lock member independently of the sensing member.