To provide a gage for a pressure sensor which does not require any correction to the balance among electric resistance values of a Wheatstone bridge even if there are relative varieties in the locations of formation of resistor pattern films and electrode pattern films.

A gage for a pressure sensor is formed by bringing four resistor pattern films 2a-2d into adhesion onto a diaphragm 1 in such a way as to form a Wheatstone bridge and electrode pattern films 3a-3d for external connection into adhesion in such a way as to cover the connection parts of the resistor pattern films 2a-2d. The electrode pattern films 3a-3d located at both ends of the resistor pattern films 2a-2d are each provided with sides parallel with each other to the sides facing each other, and the resistor pattern films 2a-2d with the same width at their both end parts are connected to the sides. Even if there are varieties in the locations of formation of the resistor pattern films 2a-2d and electrode pattern films 3a-3d, as the lengths and areas of the resistor pattern films 2a-2d each exposed between the electrode pattern films 3a-3d are constant at all times, the balance among electric resistance values of the Wheatstone bridge does not collapse.