A sensor assembly includes: a sensor module including a cylindrical portion into which a measurement target fluid is introduced and a diaphragm including a first surface in contact with the measurement target fluid and a second surface provided with a detector; a joint provided with a pressure introduction port for introducing the measurement target fluid to the sensor module; a cylindrical base member surrounding the sensor module; an electronic circuit attached to the base member to receive a detection signal outputted by the detector; and a temperature sensor electrically connected with the electronic circuit. The temperature sensor includes a temperature detector for detecting temperature, and a lead wire electrically connecting the temperature detector and the electronic circuit. The base member is provided with a receiver for receiving the temperature detector and the lead wire.