A superconducting disk resonator is disclosed that includes a dielectric base substrate having dielectric anisotropy, a disk type superconducting resonator pattern that is formed on the dielectric base substrate with superconducting material, and a pair of signal input/output lines arranged on the dielectric base substrate and extending in a straight line towards the disk type superconducting resonator pattern. The direction of dielectric anisotropy of the dielectric base substrate is oriented at .+-.90 degrees with respect to an extending direction of the pair of signal input/output lines.