| 摘要 |
A gas sensor has a sensor element of a cup shape and an insulation electrical heater for heating the sensor element. The insulation electrical heater is placed in an inside of a hollow part of the sensor element. An insulation length extension area is formed on an outer peripheral surface of the insulation electrical heater between electrodes of the insulation electrical heater and a reference electrode metal member tightly bonded onto the sensor element. The insulation length extension area is composed of a plurality of flanges, a rectangle flange part formed in one body, a taper shaped flange part, or a bended flange part.
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