To provide a coupling for a connecting part for operation which is located between a tension lever and a tension wheel and does not need a large space and has a suitable structure with no high load is a manually actuated strapping unit.

This strapping unit is provided with a base plate provided with a supporting face for arranging an article to be packed, a seal device by which two strap layers can permanently be connected with each other and a tension device by which a tension can be applied on the straps. The tension device has a manually actuated tension lever and the tension wheel arranged on a tension shaft can be operated by means of the tension lever. The apparatus is provided with a separating means by which the straps can be cut. The coupling (44) in the axial direction is provided in the flow of force from the tension lever (39) to the tension wheel (38).