The present invention relates to a medical sensor (1) for measuring pulse, blood, tissue and/or skin parameters using electromagnetic waves in the transmission method, comprising a carrier part (2) for pushing onto a patient's finger or toe. A first carrier leg (12) carries a transmitter unit (5) and a second carrier leg (13) carries a receiver unit (6). A carrier base (14) connects the two carrier legs (12, 13) to one another in the region of a tip of the finger or toe. A spring part (3) is arranged on the outside of the carrier part (2) such that a first spring leg (15) bears against the first carrier leg (12) and a second spring leg (16bear against the second carrier leg (13). The carrier part (2) is made of a more flexible material than the spring part (3), in which the spring legs (15, 16) prestress the carrier legs (12, 13) toward one another.