Abstract: A stress sensor in which the direction and magnitude of a stress being applied to a post (6) bonded to or integrated with the surface of an insulating board (3) can be grasped from variation in the resistance of a plurality of resistor elements (8) being stimulated by application of the stress while suppressing variation in the shape of each resistor (2). The resistor element (8) comprises a resistor (4) formed, by screen print, between a pair of electrodes for the resistor element, i.e. circuit pattern electrodes (1), arranged on the surface of the insulating board (3). The electrode is connected, through a conductor (9), with a board terminal part (5) arranged at one end of the insulating board (3). The electrode (1) and the conductor (9) or a print accuracy adjusting member (7) have a constant height from the surface of the insulating board (3).