Patent ID: 7268008

Claim:
A method for manufacturing a pressure sensor comprising the steps of: preparing a semiconductor substrate having a sensor element thereon, the sensor element generating a detection signal in accordance with pressure as a detection object; forming an insulation film having a contact hole on a surface of the semiconductor substrate, the contact hole connecting to the sensor element; forming a first metal film on a predetermined part of the insulation film, the first metal film electrically connecting to the sensor element through the contact hole; forming a first protection film on the first metal film and the insulation film to expose a pad region of the first metal film; forming a second protection film made of organic resin on the first metal film and the first protection film to expose the pad region of the first metal film and a part of the first protection film disposed around the pad region; performing reduction treatment of adhesive force on a surface of the second protection film after the step of forming the second protection film, the adhesive force being between the second protection film and a second metal film thereon; forming the second metal film on the pad region of the first metal film and the part of the first protection film disposed around the pad region after the step of performing the reduction treatment; and removing a part of the second metal film disposed on the surface of the second protection film.