Dielectric filter, dielectric duplexer and communication apparatus

A dielectric filter comprising a dielectric block having first and second opposed surfaces with a width direction and a length direction greater than the width direction. At least three conductive through holes are arrayed in the dielectric block in the length direction. In one embodiment, a sectional shape of at least one conductive through hole located between two other conductive through holes of the at least three conductive through holes is elongated in the width direction. In another embodiment, a sectional shape of two conductive through holes on either side of a third conductive through hole of the at least three conductive through holes is elongated in the width direction. With these arrangements, the jumping coupling capacitance is controlled.