A backlight module is provided. The backlight module includes a frame, a reflector and a holding structure for holding the reflector on the frame. The frame has a first through hole and the reflector has a second through hole. The reflector is disposed on the frame. The holding structure includes a first clamp portion, a second clamp portion and a shaft portion. The shaft portion is used for connecting the first clamp portion and the second clamp portion. The first clamp portion and the second clamp portion are used for clamping the reflector and the frame when the shaft portion is inserted into the first through hole and the second through hole.