To detect the residual quantity of a cable in operating always.

This device has a cable drum 11 for winding a cable K, a driving means 17 for giving a revolving force to this cable drum 11, a frame body 13 which supports the cable drum 11 freely-rotatably, and a cable guiding mechanism 14 which moves along the center axis direction of the cable drum 11 along with the rotation of the cable drum 11 at a specified speed and guides the winding of the cable K performed successively in a dense condition on the winding surface of the cable drum 11. And a plurality of light sources 15 are arranged equally along the radial direction of the cable drum 11 on the side of one end in the direction of the center axis of the cable drum 11, and a plurality of photosensors 16 are arranged equally along the radial direction of the cable drum 11 on the side of the other end in the direction of the center axis of the cable drum 11 corresponding to these individual light sources 15.