A ceramic electronic device includes a dielectric layer and an internal electrode layer that are alternately stacked, wherein the dielectric layer contains yttria-stabilized zirconia and (Cax1Bax2Sr1-x1-x2)(TiyZr1-y)O3 (0.6≤x1≤0.9, 0≤x2≤0.1, 0≤y≤0.1) as a main component, and wherein, in the dielectric layer, a concentration of the yttria-stabilized zirconia when a total amount of Ti and Zr is 100 mol % is 0.5 mol % or more and 5.0 mol % or less.