Patent ID: 8826725

Claim:
A gas detector comprising: a gas detection element configured such that at least a heat-generating resistor and an insulation layer are laminated on a semiconductor substrate, and the insulation layer covers the heat-generating resistor; and control means for controlling energization of the heat-generating resistor and detecting gas-to-be-detected on the basis of resistance of the energized heat-generating resistor; wherein the gas detection element has an oxide film laminated on a surface of the insulation layer in such a manner as to cover the insulation layer, the oxide film impermeable to gas so as to restrain a change in thermal capacity of the gas detection element resulting from entry of organic silicon contained in a gaseous atmosphere into the gas detection element, and the gas impermeable oxide film forms an outermost surface layer which comes into contact with a gaseous atmosphere that contains the gas-to-be-detected.