A backlight unit includes an LED substrate including a first main surface and a second main surface on a side opposite to the first main surface, a plurality of LED elements arranged on the first main surface, one or more drive IC elements arranged on the second main surface, a chassis disposed on the second main surface side of the LED substrate, and one or more IC element covers each being in direct or indirect contact with a corresponding drive IC element of the one or more drive IC elements. The chassis includes one or more protrusions respectively corresponding to the one or more drive IC elements. Each of the one or more protrusions includes an opening that exposes the corresponding drive IC element when viewed from a normal direction of the second main surface. The IC element cover fits in the protrusion.