Patent ID: 7856890

Claim:
A method of manufacturing a pressure detector, comprising: preparing a first member that includes a sensing portion for outputting an electric signal in accordance with a pressure, a second member that includes a pressure-receiving diaphragm for receiving the pressure, and a pressure transmission member for transmitting the pressure received by the pressure-receiving diaphragm to the sensing portion; disposing the pressure transmission member between the sensing portion and the pressure-receiving diaphragm; welding the first member and the second member in a state where the pressure is applied from the pressure-receiving diaphragm to the sensing portion through the pressure transmission member; and straining one of the first member and the second member so that a preliminary load meets a predetermined value, wherein the preliminary load is a load that is applied from the pressure-receiving diaphragm to the sensing portion through the pressure transmission member in a state where no external pressure is applied to the pressure-receiving diaphragm.