Provided is a backlight device that includes: LEDs; a LED substrate; a light guide plate having a light-exiting surface, an opposite surface on an opposite side of the light-exiting surface, and a light-receiving face; a chassis; a frame; a heat dissipating member having a bottom part and a raised part; a pair of fixing members, each having a gripping part that extends along a long-side direction of the raised part and that grips each end in the long-side direction of the raised part in a direction perpendicular to a plate surface of the raised part, and a locking part that extends along the long-side direction of the raised part and that is locked to each of side faces adjacent to the light-receiving face of the light guide plate on a side of the light-receiving face. The pair of fixing members keeps a distance between the LED substrate and the light guide plate constant by fixing a distance between the gripping part and the locking part.