A backlight module including a first side frame, a plurality of first elastic holding elements, a second side frame, a plurality of second elastic holding elements, and a plurality of lamps is provided. The first side frame has a plurality of first containing grooves, and the first elastic holding elements are disposed in the first containing grooves respectively. In addition, the second side frame has a plurality of second containing grooves, and the second elastic holding elements are disposed in the second containing grooves respectively. The lamps are connected between the first side frame and the second side frame. Two ends of the lamps are fixed through the first elastic holding elements and the second elastic holding elements.