A backlight 12 includes a first LED board 18A, a second LED board 18B 18B, a light guide plate 19, a first LED drive circuit 26a, a second LED drive circuit 26b, and light reflection portions 28. The second LED board 18B is arranged in a high temperature area in which a temperature tends to become higher. The light guide plate 19 includes a pair of end surfaces opposite the first LED board 18A and the second LED board 18B, respectively, and through which rays of light from the first LED board 18A and the second LED board 18B enter, and a plate surface through which rays of light exit on a light exiting side. The first LED drive circuit 26a and the second LED drive circuit 26b are configured to supply a smaller current to the second LED board 18B than the current supplied to the first LED board 18A. The light reflection portions 28 are arranged such that an area distribution in a plane of the plate surface of the light guide plate 19 increases as a distance from one of the first LED board 18A and the second LED board 18B increases and takes the maximum value at a point closer to the second LED board 18B.