A lamp driving device includes a power supplying part and a feedback detection part. The power supplying part provides a plurality of lamps electrically connected in parallel to each other with power. The feedback detection part receives current that flows via the lamps to provide the power supplying part with a feedback signal that prevents the power supplying part from providing normal lamps with power, when at least one of the lamps are abnormal. Although one power supply provides all lamps with power, when at least one of the lamps is abnormal, then whole circuit is opened. Thus, excess current does not flow via remaining lamps that are normal. Thus, a life span of the lamps is not reduced, and a lamp driving device is safe.