A cold-cathode tube driving apparatus wherein the number of booster transformers has been reduced and the increase in installation space and in cost has been suppressed. This cold-cathode tube driving apparatus comprises a booster transformer (2); a plurality of cold-cathode tubes (3-1 to 3-N); and a time division control circuit (control circuit 6 and time division FETs 4-1 to 4-N) for lighting one or more of the plurality of cold-cathode tubes (3-1 to 3-N) in a time division manner by use of a high frequency voltage after boosted by the booster transformer (2).