GAS DETECTOR

PROBLEM TO BE SOLVED: To provide a gas detector in which the detection accuracy of a detection object gas is less likely to deteriorate even in a case where a gas sensor has large temperature dependency.SOLUTION: A storage unit 38 preliminarily stores a resistance value of a gas sensor 2 associated with humidity in standard atmosphere, as known data. A detection processing unit 35 includes a calculation section 351 for acquiring a correction value corresponding to humidity in atmosphere, and a correction section 352 for correcting a detection result of a detection object gas by using the correction value. In an inflow path of the detection object gas to the gas sensor 2, a filter is provided so that the reaction rate of the gas sensor 2 with respect to the humidity is made slower than the reaction rate of the gas sensor 2 with respect to the detection object gas. When variation per unit time of the resistance value of the gas sensor 2 becomes less than a determination threshold, the calculation section 351 calculates the correction value from the current resistance value of the gas sensor 2 and the know data in the storage unit 38.