| 摘要 |
A ceramic joining unit, ceramic heater and gas sensor, the ceramic joining unit including: a ceramic base member; an electrode pad provided on a surface of the ceramic base member; a coupling terminal; and a joining portion, wherein the electrode pad includes: a first layer in contact with the ceramic base member; and a second layer laminated on a surface of the first layer and in contact with the joining portion, wherein each of the first and second layers contains a ceramic material as a main component, a content of the ceramic material in the first layer is greater than that of the second layer, and a contour of the first layer is located outside of a contour of the second layer at an entire periphery of the first layer.
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