PROBLEM TO BE SOLVED: To provide a zirconia sintered body having high mechanical strength and excellent translucency, and a zirconia raw material powder which can be used for producing the same.SOLUTION: The zirconia raw material powder comprises fine powder which has a crystal phase exclusively containing tetragonal crystals, a half peak width of a first peak of the tetragonal crystals in a powder XRD measurement which is restricted to a sufficiently small value in a range of 0.26 to 0.31°, and a BET specific surface area of 17 (m/g) or more. Therefore, by using this raw material powder, pressure molding the same in a desired shape, and further subjecting the molded material to a calcination treatment, there can be obtained a zirconia sintered body having high translucency and also high mechanical strength.SELECTED DRAWING: Figure 3
