PURPOSE: To miniaturize a filter by connecting a coaxial dielectric resonator to a wiring pattern on a base, disconnecting the connecting point so as to constitute a coupling capacitor and providing a grounding electrode to a rear face of the base so as to miniaturize the resonator.

CONSTITUTION: Plural coaxial dielectric resonators 1 aare soldered to the wiring pattern on the base 3 by a conductor pin 2. Both sides of the connecting poing connected of the wiring pattern 4 with the conductor pin 2 are cut off as a comb shape and the cut-off part forms a coupling capacitor 8 made of stray capacitance. Further, a grounding electrode 9 is provided opposed to the wiring pattern 4 at the rear face of the base 3 and parallel distribution capacity is constituted to the resonator 1. The wavelength of the resonator 1 is reduced by the capacitance to miniaturize the resonator 1 and the filter using them is miniaturized.