Patent ID: 7036384

Claim:
A pressure sensor comprising: a semiconductor substrate having a diaphragm in which an electrical circuit including a gauge resistance is formed; an insulation film provided on a surface of the semiconductor substrate, the insulation film having a conductor hole from which a predetermined portion of the electrical circuit is exposed; a first metal film provided on the insulation film and electrically connected to the electrical circuit through the conductor hole; a second metal film having a corrosion resistance and provided on the first metal film; a first protective film which covers the first metal film and has an opening portion from which a portion of the second metal film is exposed; a wire bonded to the second metal film at the portion exposed from the first protective film; and a second protective film made of an organic material, which covers at least the surface of the second metal film exposed from the first protective film, and a vicinity of the opening portion of the first protective film.