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PROBLEM TO BE SOLVED : To provide particles of high purity rare-earths oxide for thermal spraying, which can form a thermal sprayed coating with high adhesiveness in spite of employing rare-earths oxide with high melting point. SOLUTION : The particles of rare-earths oxide for thermal spraying have a mean particle diameter of 3-20 μm, dispersion index of 0.4 or less, and an aspect ratio of 2 or less.