| 摘要 |
Provided is a gas sensor, the manufacturing cost of which can be reduced and in which the corrosion of a metal shell can be prevented from occurring at a place where a gas detection element and the metal shell are electrically conducted to each other. When exhaust gas contains water vapor, for example, the water vapor penetrates the clearance between a protector (47) and a metal shell (13). The gas sensor (3) according to the present invention, however, prevents corrosion from occurring on the side of the metal shell (13) at a contact portion between a flange portion (57) on the rear end side of the protector (47) and a step portion (17) of the metal shell (13), in such a way that the minimum clearance (W2) between the protector (47) and the metal shell (13) is narrowed and corrosion is allowed to actively occur in the vicinity of an end side of the metal shell (13) (that is, sacrificial protection is used). |
