Abstract: A locking device for locking unattached objects to e.g. a stationary part of a building or for locking objects to one another, has a lock casing (1) in which a drum (2) is mounted for rotation during unwinding and winding-on of a strap, a line, or preferably a wire (5), the free end of which preferably is provided with an end piece (6) adapted to be inserted to an opening in the lock casing (1) and to be secured with the aid of a lock (7). The drum (2) is connected to a knob (9) by means of which a wire (5) may be wound onto the drum (2) and be tensioned by a desired tensioning force. The knob (9) is connected to the drum (2) via coupling means (2.2, 9.2) and in its non-actuated position, the knob (9) disconnected from the drum (2). When the end piece (6) is locked within the casing (1), the drum (2) is simultaneously locked against rotation in an unwinding direction.