Patent ID: 8516896

Claim:
A method of manufacturing a semiconductor pressure sensor, comprising the steps of: (a) forming a first insulating film having a plurality of first openings on a semiconductor substrate; (b) forming a sacrificial layer on said first insulating film, being in contact with said semiconductor substrate in said plurality of first openings of said first insulating film; (c) forming a multilayer structure on said sacrificial layer, said multilayer structure including a polysilicon diaphragm, a polysilicon gauge resistor formed on a side of a space which is to serve as a vacuum chamber below said polysilicon diaphragm, and a group of insulating films containing said polysilicon diaphragm and said polysilicon gauge resistor and having an etching solution introduction hole in contact with said sacrificial layer; and (d) etching said sacrificial layer with an etching solution supplied through said etching solution introduction hole to thereby obtain a diaphragm body formed of said multilayer structure, which functions on the vacuum chamber, and etching a surface of said semiconductor substrate below said plurality of first openings of said first insulating film to thereby form said space which is to serve as said vacuum chamber and a diaphragm stopper disposed in said space, protruding toward near the center of the diaphragm body.