Multiple-light discharge lamp lighting device

A multiple-light discharge lamp lighting device comprising inverter means that outputs a high-frequency voltage and a plurality of inverter transformers, the multiple-light discharge lamp lighting device lighting-on a plurality of discharge lamps connected to secondary windings of the plurality of inverter transformers,

• wherein a variable inductance element as a ballast element is connected in series to each of primary windings of the plurality of the inverter transformers;
• and
• the variable inductance element is provided with a main winding and a control winding in such a manner that the main winding is connected to the primary winding of the inverter transformer, and the control winding has current signal input that corresponds to fluctuation of tube current flowing in the discharge lamps for variably controlling inductance value of the variable inductance element so as to stabilize the tube current flowing in the discharge lamps.