To provide a variable resonance circuit which exhibits a low degree of waveform distortion or intermodulation distortion, a high electric power resistance and a low loss.

Several variable capacitors C1-C4 each using a thin-film dielectric layer whose dielectric constant varies with applied voltage are connected in series between an input terminal I and an output terminal O of high-frequency signal. First bias lines B11, B12 and B13 on the high potential side of applied voltage and second bias lines B21 and B22 on the low potential side are alternately connected to both ends of the several variable capacitors and between the capacitors. In this way, the rate of capacitance change of a variable capacitance capacitor by bias signal can be maximally used and the resonance frequency can be changed in a wide range of frequencies. In addition, the variable capacitance capacitor exhibits a low degree of waveform distortion or intermodulation distortion in a high-frequency electronic component, a high electric power resistance and a low loss even at a high-frequency.