| 摘要 |
A gas sensor is disclosed having a gas sensing element, an insulating element holder and a housing. The insulating element holder has a stepped engaging shoulder and the housing has an outer periphery, formed with a tool-fitting portion adapted to engage a mounting tool, and an inner peripheral wall having a holder rest shoulder facing the stepped engaging shoulder. A packing element is interposed between the stepped engaging shoulder and the holder rest shoulder so as to provide a hermetically sealing effect between an atmospheric side ambience of the gas sensor and a measuring gas side ambience thereof. The holder rest shoulder is formed at an opening angle, representing an angle defined with a pair of profile lines on a plane including a center axis of the gas sensor in cross section thereof, which is set to be less than 100°.
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