To provide a low-cost self-excited inverter driving circuit exhibiting an excellent operational efficiency. A main inverter section is so constructed that a part of output signals is fed back by a resonance loop circuit to cause a self-excited oscillation to occur in the vicinity of a resonance frequency decided by leakage inductors and capacitors on the secondary side of a high voltage transformer, thereby performing an inverter operation. It is further arranged that a halt interval setting signal, which is generated by a triangular wave forming circuit and a control section, is applied to the main inverter section, thereby halting the inverter operation in accordance with the halt interval setting signal.