A carbon dioxide sensor

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PROBLEM TO BE SOLVED : To provide a carbon dioxide sensor not influenced by various gases inclusive of steam at all and having excellent initial stability. SOLUTION : The solid electrolyte type carbon dioxide sensor element consists of a solid electrolyte containing trivalent ions having a NASICON type or β-iron sulfate type structure suitable for the conduction of ions as a main conductive ion seed, a solid electrolyte containing oxide ions as a main ion seed, and a detection electrode containing a solid solution wherein an alkaline earth metal element is substituted for a part of a rear earth element in a rare earth carbonic acid oxide.