| 摘要 |
An oxygen sensor including an oxygen concentration sensing unit including a pair of electrodes and a solid electrolyte layer which is disposed between the pair of electrodes and has an oxygen ion conductivity. A porous protective coat is disposed on an outer surface of the oxygen concentration sensing unit. A protector covers the oxygen concentration sensing unit via a space between the protector and the porous protective coat and has a plurality of inlet holes through which a gas to be measured is introduced into the space. A ratio of a thickness of the porous protective coat to a diameter of each of the plurality of inlet holes is in a range of from 5% to 50%.
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