PURPOSE: To provide a laminated dielectric part having a high dielectric constant and a high no-load Q value by overlapping multiple sheet dielectric porcelain compositions made of oxides of Bi, Ca, Ba, Nb at specific ratios and multiple internal conductors in turn, and providing input/output electrodes on this laminated body.

CONSTITUTION: This dielectric porcelain composition is expressed by the formula xBiO3/2-y(Ca1-wBaw)O-zNbO5/2, where 0.44≤x≤0.55, 0.16≤y≤0.24, 0.29≤z≤0.36, 0≤w≤1.0, and x+y+z=1.0. Multiple sheet dielectric substances made of this dielectric composition and multiple internal conductors are overlapped in turn to form a laminated body constituted of dielectric layers 1 and internal conductor layers 2, 3, 4, and input/output electrodes 5 are provided on this laminated body. A laminated dielectric part can be obtained which has the relative dielectric constant of about 50 or above, the no-load Q value of about 300 or above, and the absolute value of the temperature coefficient of the resonance frequency of 100ppm/°C or below and can be baked at about 1050°C or below.