| 摘要 |
A gas sensor is provided which can efficiently flow air into a casing while having a sufficient on-axis sectional area in a ceramic separator for allowing lead wires to pass therethrough. The oxygen sensor has a ceramic separator main body portion axially formed with a plurality of separator-side lead wire insertion holes penetrating therethrough, whereby a first part thereof is arranged to extend to an inner side of a filter support portion. The first part has an on-axis sectional outer shape formed in a shape other than a circle, e.g. a polygonal shape, such as a square shape. By making the on-axis sectional outer shape of the ceramic separator main body part non-circular as above, it is possible to locally expand a gap defined between an outer peripheral surface of the ceramic separator and an inner surface of the filter support portion. This makes it possible to efficiently flow external air into the casing while providing the ceramic separator with a sufficient on-axis sectional area for passing through lead wires.
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