Patent ID: 7666699

Claim:
A method of manufacturing a semiconductor strain gauge, comprising forming a diffused resistance region of opposite conduction type to the semiconductor substrate on a surface of a semiconductor substrate of a fixed conduction type, forming around the diffused resistance region a high-density impurity diffused layer of an identical conduction type to the semiconductor substrate on which the impurity is doped higher in density than the semiconductor substrate, forming a guard film on the surface of the semiconductor substrate, removing parts of the guard film in a at both end parts of the diffused resistance region and on an upper plane of a part of the high-density impurity diffused layer, and forming two electrode films respectively on the both end parts of which one film is connected to one place of the diffused resistance region and the other film is connected to the high-density impurity diffused layer and the diffused resistance region such that voltage applied to the other electrode film is applied to the high-density impurity diffused layer such as to prevent current leakage from the diffused resistance region to the semiconductor substrate.