Pressure sensor, relay substrate therefor, and relay substrate unit therefor

A relay substrate for a pressure sensor, in which the relay substrate is connected to a pressure sensor via a plurality of electric wires, the pressure sensor including:

• a pressure detecting element configured to receive a drive voltage from an outside circuit and electrically send a pressure detection signal to the outside circuit so as to detect a pressure of fluid;
• and
• an electrically connected portion connected to the pressure detecting element so as to supply the drive voltage and connected to the plurality of electric wires so as to send the pressure detection signal,
• wherein the relay substrate is connected to the electrically connected portion via the plurality of electric wires and comprises a converting circuit mounted on the relay substrate, the converting circuit converting either or both of the drive voltage supplied from the outside circuit and the pressure detection signal sent to the outside circuit.