An exemplary backlight module (1) includes a light guide plate (3) including two light incident surfaces (31), two light sources (4) provided adjacent to the light incident surfaces of the light guide plate, and a holding frame (5). The holding frame includes two sliding frames (52) and a bottom plate (51). Each sliding frame includes two side walls opposite to each other and a connecting wall perpendicularly connected with the side walls. The sliding frame defines a sliding structure. The bottom plate is slidingly received in the sliding structures of the sliding frames. The bottom plate and the sliding frame cooperatively form a space to accommodate the light guide plate and the light source therein.