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PROBLEM TO BE SOLVED : To provide a hydride ion conductor having a high conduction property with compositions of hydrogen and oxygen wider than Ln2-XMXAHyO3. SOLUTION : A hydride ion conductor has a composition represented by general formula M1XM2yAHzOα. (In the formula, M1 represents a trivalent rare earth element, M2 represents an alkaline earth metal element, A represents Li, Na, Sc, Co, Ni, Cu, Mn or Fe, and the following conditions are satisfied : 0≤x≤2; 0≤y≤2; x+y=2; 0
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