This invention provides a discharge tube driving device which drives a plurality of discharge tubes using less driving transformers. The discharge tube driving device includes a switching circuit which is controlled by a switching pulse and generates a driving pulse, a driving transformer which has a primary winding for receiving the driving pulse and a secondary winding for generating a high-frequency driving signal, a first discharge tube group including a plurality of discharge tubes, and a second discharge tube group including a plurality of discharge tubes. One-side terminals of the plurality of discharge tubes in the first discharge tube group are connected to the positive high-voltage terminal of the secondary winding of the driving transformer. One-side terminals of the plurality of discharge tubes in the second discharge tube group are connected to the negative high-voltage terminal of the secondary winding of the driving transformer. Another-side terminals of the plurality of discharge tubes in the first discharge tube group are respectively connected to another-side terminals of the plurality of discharge tubes in the second discharge tube group.