Patent ID: 7321287

Claim:
A gas sensor comprising: a porous plate-like sintered body comprising trisilicon tetranitride needle crystals; one first catalyst metal thin film comprising a first catalyst metal and one second catalyst metal thin film comprising a second crystal metal, formed on one surface of the porous plate-like sintered body in the order from an introduction side of a measurement gas in a state that the first catalyst metal thin film and the second catalyst metal thin film are non-contacted with each other; oxygen ion-conductive solid electrolyte thin films formed on the respective surface of the first catalyst metal thin film and the second catalyst metal thin film; a surface layer thin film comprising the first catalyst metal, formed on each surface of the respective ion-conductive solid electrolyte thin films in a state that the first catalyst metal thin film and the second catalyst metal thin film are non-contacted with each other, so that a first measurement part and a third measurement part are constituted; and a glass sealing layer comprising silicon oxide, formed on other surface of the porous plate-like sintered body, a surface other than the surface of the porous plate-like sintered body having the first catalyst metal thin film and the second catalyst metal thin film formed thereon, and a side of the first measurement part and the third measurement part.