Pressure sensor

A pressure sensor which detects variation in pressure, comprising:

• a hollow sensor main body which includes a cavity formed inside the sensor main body and a communication opening which allows the cavity and the outside of the sensor main body to communicate with each other;
• and
• a cantilever which is disposed so as to close the communication opening in a cantilever state in which a distal end portion of the cantilever is a free end and a proximal end portion thereof is supported by the sensor main body, and which bends according to a pressure difference between the cavity and the outside of the sensor main body,
• wherein a gap which configures a portion of the communication opening is formed on the proximal end portion,
• wherein the proximal end portion is partitioned into a plurality of branch portions by gaps in a second direction orthogonal to a first direction in which the proximal end portion and the distal end portion are connected to each other in plan view,
• wherein a first subset of the plurality of branch portions includes displacement detection portions which detect displacement according to the bending of the cantilever on the basis of a change in a resistance value corresponding to the displacement of the cantilever,
• wherein a second subset of the plurality of branch portions does not include displacement detection portions,
• wherein the displacement detection portions include a plurality of branch detection portions which are electrically partitioned in the second direction by a partition portion having a larger resistance value than that of the displacement detection portions,
• wherein a piezoresistor is provided in the displacement detection portions, and
• wherein the branch detection portions are electrically connected to each other via the piezoresistor so as to go around an outside of the partition portion.