PURPOSE: A locking apparatus for a bicycle is provided to efficiently keep the locking apparatus by winding a cable of the locking apparatus around a bicycle frame through inner and outer tubes. CONSTITUTION: A locking apparatus for a bicycle comprises an inner tube, an outer tube, and a cable(300). The inner tube is detachably coupled to a bicycle frame. The outer tube is rotatably coupled to the outer surface of the inner tube. One end of the cable is wound around the inner tube, and the other end is entered into a through hole(201) formed in the outer tube.
