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This thermal spray powder contains a rare-earth element, and at least one element which is a diluent element that is not a rare-earth element or oxygen, and which is selected from, for example, zinc, silicon, boron, phosphorous, titanium, calcium, strontium and magnesium. A sintered body of a single oxide of the diluent element has an erosion rate under specific etching conditions that is at least five times the erosion rate of a yttrium oxide sintered body under the same etching conditions.