GAS SENSOR

PROBLEM TO BE SOLVED: To provide a gas sensor having a wide detection range, in a gas sensor detecting the concentration of conductive minute particles included in measured gas, by a simple structure.SOLUTION: The gas sensor 1, which measures resistance values R, Rchanging the deposition amount Q of the conductive minute particles PM collected and deposited in detecting portions 10, 20 formed on a surface of a ceramic substrate 30 so as to detect the concentration of the PM in the measured gas, comprises the plurality of the detecting portions 10, 20 having different detection ranges with those plural detection ranges DR, DRbeing set to be partially superimposed.