A sensor device for detecting a displacement of a master brake cylinder piston of a master brake cylinder situated on and/or in a hydraulic unit includes: a sensor element; an evaluation electronics system; a first molded part on or in which the at least one sensor element is situated, the first molded part including at least one first electrical contact element; and a second molded part. The at least one first electrical contact element contacts at least one second electrical contact element of the second molded part which is at least partially introduced into the second opening.