Gas sensor provided with flange portion of cover thereof

A gas sensor comprising:

• a sensor element having a detecting portion exposed to detection gas to perform gas detection;
• an insulator made of a ceramic material, supporting the sensor element in a state where the detecting portion is protruded therefrom, the sensor element being inserted through the insulator;
• a housing made of metal disposed in an outer periphery of the insulator, supporting the insulator;
• an inner cover made of metal, covering the detecting portion and having an inner through hole that allows the detection gas to flow therethrough;
• and
• an outer cover made of metal, covering the inner cover such that a gas passage through which the detection gas flows is formed between the outer cover and the inner cover and having an outer through hole that allows the detection gas to flow therethrough,
• wherein
• an inner flange portion formed over an entire periphery of an end portion of the inner cover and an outer flange portion formed over an entire periphery of an end portion of the outer cover are supported between the insulator and the housing;
• an end face of the inner flange portion and an end face of the outer flange portion are mutually offset;
• a corner portion is formed between the end face and a surface in either one of the inner flange portion and the outer flange portion;
• and
• the corner portion formed in either one of the inner flange portion and the outer flange portion protrudes into the surface of the other flange portion, or an end portion in either one of the inner flange portion and the outer flange portion is bent to overhang the corner portion in the other flange portion formed between the end face and the surface.