Abstract: Method for securing a wire in its tensioned condition in a wire driving type window regulator comprising a carrier plate to which a window glass is secured mounted on a pair of guide rails, a raising and a lowering wires each one end of which is secured to the carrier plate and each intermediate portion of which is inserted into an outer tube, said wires being moved up and down directions along a reciprocal passage running partially along the guide rails by a driving means, is carried out by boring a guide hole on either of supporting plates which support the guide rails into which a tube end plug is slidably inserted, and after then the tube end plug is pressed in the tensioned direction of the wire, and an edge of an opening of the guide hole being cut to make a cut piece which is erected so as to maintain the tensioned condition of the wire.