An inverter which performs switching operation that corresponds to a single frequency in response to drive signals (VGS1 to VGS4). An inductance element (L) is connected between output terminals so that it may provide parallel resonance with the total equivalent capacitance, which is the sum of the equivalent capacitance of the inverter (Q1 to Q4) viewed from the terminals and the equivalent capacitance of a load (LO). This makes it possible to decrease charge-discharge losses of capacitances (Coss1 to Coss4) in the source and drain.
