Ngk Insulators, Inc.

Kosuke Nakagawa

Sang Jae Lee

Sumiko Horisaka

A gas sensor having a sensor element that includes an inner space for introducing a measurement gas therein from an external space and a pump cell which has a first electrode formed on a surface of the inner space and a second electrode formed in a space different from the inner space and is provided to pump oxygen out of the inner space by applying a predetermined voltage between the first electrode and the second electrode. Assuming that the length of the inner space in a short-side direction of the sensor element as viewed from the front end portion side thereof is xand the length of the inner space in a longitudinal direction of the sensor element as viewed from the front end portion side thereof is x, the following inequality is satisfied: 0.05&#x2266;xx&#x2266;0.25.

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Nagoya, Japan

Kosuke Nakagawa