An object is to prevent fall of a lamp clip due to an external factor such as vibration or impact. It is structured that a reflective member 30 provided inside a backlight device has fitting holes 32 each including an insertion hole 32b and a holding hole 32a, a pair of fitting holes 32 are provided in a direction where the holding holes 32a with respect to the insertion holes 32b are mutually opposed, a pair of locking sections 16 on a substrate 12 of a lamp clip 10 are inserted into the insertion holes 32b in the fitting holes 32, and thereafter, the lamp clip 10 is rotated counter-clockwise or clockwise, so that the locking sections 16 are held in the holding hole 32a.