To suppress variations in the shift amount of the zero point of a sensor output when a pipe is connected to a pressure sensor via a clamp. A pressure sensor 100 according to the invention includes semiconductor chips 1a and 1b in two straight lines 21 and 22, orthogonal to each other, that pass through a center 30 of a diaphragm 3 in plan view, resistors R1 and R2 in the region between two supporting members 2a and 2b supporting the semiconductor chip 1a, and resistors R3 and R4 in the region between two supporting members 2c and 2d supporting the semiconductor chip 1b.