Abstract: A lighting device of the present invention includes a number of discharge tubes 17 that are arranged parallel to each other, and a power source 170 that supplies driving power for driving the discharge tubes 17 in parallel. The driving power is supplied to each of the discharge tubes 17 so that the driving power supplied to one end side of the discharge tube 17 and the driving power supplied to another end side of the discharge tube 17 are in opposite phases. A capacitor 56 is connected to the one end side of each of the discharge tubes 17 that are arranged in parallel to each other. The capacitor 56 is disposed between the power source 170 and each discharge tube 17 to make a current amount of the driving power that is supplied to each of the discharge tubes 17 to be constant.