To enable the miniaturization of a dielectric filter usable in a frequency band higher than 5 GHz.

In the structure of forming two resonators on a parallelopiped dielectric 11, input/output electrodes 13 and 14 are formed while surrounding three sides with ground electrodes in contact with the opposed sides of one surface 15 of the dielectric. The ground electrodes are formed as well on the other surfaces except the surfaces in contact with the input/output electrodes 13 and 14, and the filter is constituted by connecting the resonators. Between the resonators, a through hole 18 or groove is formed for adjusting a connection between the resonators.