METHOD OF PRODUCING GAS SENSOR AND GAS SENSOR

摘要

A gas sensor in which damage to a lead wire can be prevented, and in which a crack in an elastic seal member can be prevented even if the elastic member is thermally expanded. The gas sensor is constructed by using a seal, as the elastic seal member, having a small diameter section and a body section positioned more on the head side than the small diameter section and having an outer diameter greater than that of the small diameter section. The elastic seal member is installed such that the entire part of the body section and the head side of the small diameter section are positioned inside an outer tube member, and that the outer peripheral surface of the small diameter section (circular column section) straddles, relative to the outer tube member when seen in the axis direction of the gas sensor, the rear end of the outer tube member. Further, a gap (S) is formed between the outer peripheral surface of the small diameter section and the rear end of the outer tube member. It is preferable from the view point of more effectively restricting damage to a lead wire that the length La in the axis direction between the rear end of the outer tube member and the peripheral edge of a rear end surface of the small diameter section is set to 0.6 mm or greater.