Pressure sensor

A pressure sensor which detects variation in pressures, 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 is configured to bend 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,
• the proximal end portion is partitioned into a plurality of branch portions by the gap 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,
• at least any one of the plurality of branch portions includes a displacement detection portion which detects displacement according to the bending of the cantilever on the basis of a change in a resistance value corresponding to the displacement,
• a length of the displacement detection portion along the second direction is shorter than a length of the branch portion along the second direction,
• the displacement detection portion includes 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 portion,
• the branch detection portions are electrically connected to each other via a connection portion so as to go around the outside of the partition portion, and
• the branch detection portions and the connection portion are each configured of a piezoresistor.