PURPOSE: To reduce manufacturing cost and to reduce the fluctuation of a resonance frequency by leading positively the heat generated from a dielectric ceramics resonance element externally for dissipation so as to reduce a temperature rise.

CONSTITUTION: In the dielectric ceramics resonator 20 in which a dielectric ceramics resonator element 12 is fixed, for example, an thermal conductor 22 whose one terminal is in line contact or in face contact with an outer circumferential face 12a of the dielectric ceramic resonance element and whose other end is in face contact with an inner wall face 21 of an outer tube 21 of the resonator is used to immediately dissipate heat generated from the resonance element arranged in the inside to the outside of the resonator from an outer tube.