A backlight device (100) includes: a case (1); a plurality of LED modules (2) provided in series on a bottom portion (1a) of the case (1); a reflective sheet (3); a diffusing plate (4); and an optical sheet (5). At the bottom portion (1a) of the case (1), four recessed portions (10) are formed in a horizontal direction of a display screen, and each of the LED modules 2 is fixed thereon with screws (11). At opposite ends of the recessed portion (10), opening portions (10a) and (10b) each having a lid member (13) are formed, thus making it possible to remove the LED modules (2) without disassembling the backlight device (100).