PROBLEM TO BE SOLVED: To provide a dental zirconia sintered body that has less occurrence of fracture or detachment when used as a frame or when the frame is bonded to porcelain, and in which the low-temperature deterioration is suppressed.SOLUTION: The dental zirconia sintered body contains at least ZrOand YO, and satisfies the following (a) to (f) requirements: (a) it has a two layer structure of a dense layer and a porous layer (b) the porosity of the dense layer is 1.0% or less (c) the porosity of the porous layer is 5 to 20% (d) the average pore diameter of the porous layer is 5 to 40 &mum (e) the YO/ZrOmole ratio of the dense layer and porous layer is 2.0/98.0 to 5.0/95.0 and (f) the average crystal grain size of the dense layer and the porous layer is 0.20 to 0.50 &mum.
