PURPOSE: To provide a compact and inexpensive dielectric filter having a small number of parts which can secure a composite capacitor circuit in a simple circuit.

CONSTITUTION: A level difference part 15 is formed on a side face of a dielectric block 11 at the side of an open surface 13, and a capacity pattern 16 is formed at the part 15 with a flat and approximately U-shaped part 17 which is not applied with a conductor film and links the surface 13 at both ends of the pattern 16. Then a 1st conductor film 14a is formed in an inner space of the part 17 and a 2nd conductor film 14b is formed at the outside of the part 17 respectively. A ground capacity is formed among the films 14a and 14b and another conductor film 14. Then three dielectric resonators 10 having the patterns 16 are set so that these patterns 16 are turned in the same direction. The patterns 16 of the resonators 10 adjacent to each other are connected to each other via the inductances L1 end L2.