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A material that exhibits high ion conductivity in the conduction of proton or oxide ions, excelling in moisture resistance and reduction resistance. There is provided an ion conductor comprising an oxide of perovskite type represented by the general formula : BaZraCebM1cL1dO3-α (1) wherein M1 is at least one member selected from the group consisting of rare earths, In, Mn, Fe, Co, Ni, Al and Ga; L1 is at least one member selected from the group consisting of P, B and N; and a, b, c, d and α satisfy the relationships : 0≤a<1.2, 0
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