The invention relates a position sensor (1) for measuring the adjustment stroke of a hydraulic piston/cylinder system (3, 4) which acts on the support chock of the rolls (2) of a rolling mill stand, wherein the position sensor (1) is designed to measure a relative displacement between two components (3,4) of the piston/cylinder system (3, 4) in the displacement direction (a) thereof and wherein the position sensor (1) is equipped with a coupling element (5). In order to obtain a simple and compact structure of the coupling element while ensuring high measuring accuracy, the invention provides that the coupling element (5) has a first leaf spring element (6) extending in the displacement direction (a), wherein one end (7) of the first leaf spring element (6) is connected to a first connection member (8) and wherein the other end (9) of the first leaf spring element (6) is connected to an intermediate member (10), and that the coupling element (5) has a second leaf spring element (11) extending in the displacement direction (a), wherein one end (12) of the second leaf spring element (11) is connected to the intermediate member (10) and wherein the other end (13) of the second leaf spring element (11) is connected to a second connection member (14), wherein the planes of the first end and second leaf spring elements (6, 11) are arranged rotatably relative to one another by an angle (a) about the axis of the displacement direction (a).