A ceramic electronic device includes: a ceramic main body that has at least two edge faces facing each other, has an internal electrode layer inside thereof and has a parallelepiped shape; and external electrodes formed on the two edge faces, wherein: the external electrodes have at least a plated layer; an oxide film of a metal for plating of the plated layer on a region that is a part of at least one of four side faces of the ceramic main body other than the two edge faces, the region not being covered with the external electrodes; and a ratio of (a peak area of an oxide of the metal for plating)/(a peak area of the metal for plating) is 13.1 or more in a photoelectron spectrum of an outermost surface of the oxide film.