Patent ID: 8358494

Claim:
A sintered dielectric ceramic having crystal grains and comprising: a main component comprising a barium titanate based composite oxide represented by the general formula: (Ba 1-h-m-x Ca h Sr m Re x ) k (Ti 1-n-y Zr n M y )O 3 , where Re is at least one member of the group consisting of La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, and Y, M is at least one member of the group consisting of Mg, Ni, Mn, Al, Cr, and Zn, 0.05≦x≦0.50, 0.02≦y≦0.3, 0.85≦k≦1.05, 0≦h≦0.25, 0≦m≦0.50, and 0≦n≦0.40; and a sintering aid accessory component, wherein the average grain diameter of the crystal grains in the sintered body is 0.6 μm or less.