To provide a dielectric resonator which readily enhances the positional accuracy of the dielectric resonator, especially against a mounted substrate and also enhances productivity and a dielectric resonator device that uses it.

This dielectric resonator 2 in a TE010 mode is configured by forming electrodes which has opening parts that face opposite to each other on both principal planes of a dielectric plate 22 and plural conductive projecting parts for jointing are formed on the electrodes of the dielectric plate. The resonator 2 is mounted on electrodes 29 for mounting on the plate 1 through the conductive projecting parts for joining.