A method and a device for folding a cover material on a medical sensor having a carrier material which is to be fixed to the skin of a patient and which, on the side facing the patient, is provided with an adhesion or adhesive layer to which the cover material is applied, wherein a section of the cover material which is opposite an adhesion-layer-free section of the carrier material forms a tab. The method and the device are based on the use of a tool for folding the cover material which has at least two contact surfaces which intersect at an edge which runs parallel to the plane of the combination of carrier material and cover material. The tool is moved on an axis which runs at an angle to the plane of the combination of carrier material and cover material in such a way that the tab is gripped by the tool and folded over by the tool. After the tab has been folded over, pressure is applied to the folded-over section of the carrier material to produce a folded edge.
