Patent ID: 7550402

Claim:
A production method of a ceramic electronic device including a dielectric layer comprising: preparing a dielectric layer paste including a main component and a subcomponent, the subcomponent including—a granular Al compound having a maximum particle diameter of in a range of 0.2 to 5.1 μm, forming a green sheet by using the dielectric layer paste, forming a green chip from the green sheet, and firing the green chip; wherein a content of said Al compound is more than 0 to 4.0 moles in terms of Al 2 O 3 with respect to 100 moles of the main component, a C.V. value of a distribution of Al 2 O 3 calculated by a formula (1) below from standard deviation σ of detection strength and an average detection strengh × of the Al 2 O 3 distribution in said dielectric layer is 100 or lower, wherein the formula (1) for C.V. value is (standard deviation σ of detection strength/an average detection strength×)×100; (1) said dielectric layer further includes a first subcomponent including at least one kind selected from MgO, CaO, BaO and SrO; a second subcomponent including an oxide silicon as a main component; a third subcomponent including at least one kind selected from V 2 O 5 , MoO 3 and WO 3 ; and a fourth subcomponent including an oxide of R wherein R is at least one kind selected from Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu; and ratios of the respective subcomponents with respect to 100 moles of said main component are first subcomponent: more than 0 to 3.0 moles second subcomponent: 2 to 10 moles third subcomponent: 0.01 to 0.5 moles, and fourth subcomponent: 0.5 to 7 moles, wherein the number of moles of the fourth subcomponent is a ratio of R alone.