The invention relates to a zirconia sintered body, a zirconia composition and a zirconia calcined body, a production method of these, and a dental prosthesis. Provided is a zirconia sintered body having a gradation. This zirconia composition production method includes a step for producing multiple lamination powders which contain zirconia, a stabilizer for suppressing phase shifts of the zirconia, and a pigment and which contain different amounts of pigment, and a lamination step for laminating the multiple lamination powders in a mold. In the lamination step, the mold is vibrated after filling said mold with at least two lamination powders.