Patent ID: 7323428

Claim:
A ceramic electronic device comprising a dielectric layer, wherein: said dielectric layer includes a main component expressed by a composition formula of Ba m TiO 2+m , wherein “in” is 0.995≦m≦1.010 and a ratio of Ba and Ti is 0.995≦Ba/Ti≦1.010, and a subcomponent; said subcomponent includes an oxide of Al, and an oxide of Si or an oxide of oxide of R, where R is at least one selected from Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu; and at least a part of said oxide of Al and at least a part of said oxide of Si or said oxide of R form a secondary phase being different from a main phase mainly composed of said main component, and said secondary phase is included in said dielectric layer.