Disclosed herein is a zirconia porcelain which includes 1.5-5 mol % of yttrium oxide, 1-5.5 mol % of cerium oxide and the balance being substantially zirconium oxide. Disclosed herein also is a method of producing a zirconia porcelain, which includes the steps of preparing a mixed powder including 1.5-5 mol % of yttrium oxide, 1-5.5 mol % of cerium oxide and the balance being substantially zirconium oxide having an average particle size of less than 1.5 .mu.m when measured according to an air permeation method, shaping the mixed powder into a molding, and firing the molding thus at a temperature of 1,100.degree. C.-1,700.degree. C.