PURPOSE: To miniaturize a dielectric filter, by separating resonance frequency adjusting screws and screw rods for coupling degree adjustment and arranging them on different surfaces.

CONSTITUTION: A dielectric filter consists of a dielectric block 1, a case 5, resonance frequency adjusting screws 8 and coupling adjustment rods 10, and the rods 10 are arranged at the bottom of the case 5 through separation. A cover 7 has no screw holes for said rods 10 and the case 5 is provided with screw holes for the screw rods 10. Since the screw rods 10 had conventionally been provided to the cover 7, a fixing nut 101 for the screw rod 10 is brought into contact with a fixed nut for the screw 8, which was a great cause against the miniaturized filter. Thus, the screw rods 10 are screwed at the bottom of the case 5 and arranged through separation from the screws 8, allowing to miniaturize the dielectric filter.