In a configuration including a liquid crystal panel, a gate driver for driving a gate line of the liquid crystal panel, a data driver for driving a data line of the liquid crystal panel, a cold cathode tube used as a light source of a back light part for illuminating the liquid crystal panel from the back, a boosting circuit for driving and lighting the cold cathode tube, and a first DC power source part for generating a first DC output used as an operating power source of the data driver and also used as an operating power source of the boosting circuit, a regulator circuit for eliminating a noise component caused by the boosting circuit is inserted into a path of the first DC output ranging from the first DC power source part to the data driver.