A connecting unit for loose ends of a traction device includes a body having a traction device passage to receive the ends of the traction device and a clamping device positioned in the traction device passage. The traction device passage has a first opening into which the ends of the traction device can be inserted. The clamping device is adapted to receive the ends of the traction device and has an adjustment mechanism which biases the clamping device in a direction of a wall of the traction device passage.