Patent ID: 8287706

Claim:
A laminated gas sensor element for detecting a gas component contained in a gas to be measured, comprising: a detection element comprising a solid electrolyte body having thereon a pair of electrodes; and a heater element containing a heat-generating resistor, wherein the detection element is laminated together with the heater element, a porous protection layer is formed on at least a distal end portion of the laminated gas sensor element which is to be exposed to the gas to be measured; and an outer surface of the porous protection layer has 10 or more small pores each having a diameter of 1 Î¼m to 5 Î¼m inclusive and an aspect ratio of 0.5 to 2.0 inclusive within an area measuring 50 Î¼mÃ—50 Î¼m, and one to less than 20 large pores each having a diameter of 8 Î¼m to 20 Î¼m inclusive and an aspect ratio of 0.5 to 2.0 inclusive within an area measuring 100 Î¼mÃ—100 Î¼m.