To provide a pressure sensor that can suppress thermal influence and attain a desired sensor accuracy.SOLUTION: The present invention includes: cylindrical housings 10, 20; a pressure measurement member 80 contained in the housing, the pressure measurement member including a piezoelectric body; a diaphragm 30 having a flexible plate part 31 fixed to the top end of the housings and a protruding part 32 for delivering a load to the pressure measurement member; and a shield plate 40 arranged next to the flexible plate part to shield the diaphragm from a pressure medium. The shield plate 40 is fixed to the flexible plate part 31 by a linear joint region A.SELECTED DRAWING: Figure 6