A pressure sensor includes: a housing having openings at both ends thereof; a pair of pressure-receiving devices configured to seal the openings respectively and transmit a pressure from the outside to the interior of the housing; a force transmission device configured to connect the pair of pressure-receiving devices and transmit a force that one of the pressure-receiving devices receives to the other pressure-receiving device; and a pressure-sensitive element having a pressure-sensitive portion and a pair of base portions to be connected to both ends of the pressure-sensitive portion, wherein a line connecting the pair of base portions and a detection axis, which is a direction of detection of the force, and the direction of displacement of the force transmission device are arranged in parallel; the one of the base portions is a first fixed portion, a pair of connecting devices extending from the other base portion so as to interpose the pressure-sensitive portion are connected respectively to a pair of second fixed portions arranged at positions in symmetry with respect to the first fixed portion, the first fixed portion is fixedly supported by the force transmission device, and the second fixed portions are supported and fixed to portions where a line connecting the first fixed portion and the pair of second fixed portions intersect the housing.