A first exemplary aspect of the present invention is a dielectric resonator including: a substrate (20) including a first conductor layer, a second conductor layer, and a dielectric layer formed between the first conductor layer and the second conductor layer, a plurality of conductive through holes (10) that penetrate the substrate (20) and are formed along a first annular line, and in which at least side walls are covered with a conductor, and a plurality of non-conductive through holes (11) that penetrate the substrate (20) and are formed along a second annular line prescribed inside the first annular line, and in which side walls are covered with a non-conductor or the dielectric layer is exposed on the side walls.