in a sternum closure device for securing two sternum parts to be connected to one another , comprising an inner contact element to abut the inner face of the sternum , at least one clamping element secured thereto and projecting transversely therefrom , and comprising an outer contact element for abutment on the outer side of the sternum and which can be clamped by means of the clamping element guided through the intermediate space between the sternum parts against the inner contact element , in order to reduce the obstruction by the sternum closure device in the event of a renewed separation of the sternum parts , it is proposed that the inner contact element consists at least partially of a biocompatible plastics material .