A dielectric filter device including at least two dielectric resonator bodies juxtaposed to each other each provided with a through bore which has an inner conductive layer, a first dielectric substrate provided with electrodes on its surfaces for forming input and output capacities and a second dielectric substrate provided with capacitively coupled electrodes on its inner surfaces for forming a coupling capacity and an electrode which cooperates with the capacitively coupled electrodes to form stray capacities, the first and second dielectric substrates being superimposed and mounted on the front surfaces of the juxtaposed dielectric resonator bodies. Each dielectric resonator body comprises two longitudinally divided halves, and the inner surface of one of the halves which form the outermost resonator body is provided with conductive connecting lines each of which has one end connected with the inner conductive layer in the through bore and the other end connected with an input or output terminal provided on the lateral surface of the associated resonator body.