Backlight module

The invention provides a backlight module. The backlight module comprises an optical element, a frame body and an elastic piece. The frame body is provided with a first frame wall and a second frame wall, and one end of the first frame wall and one end of the second frame wall are connected to form a corner part and form a first included angle. An elastic piece is arranged on the frame body and comprises a flange part, a first extending part and a second extending part. The first extending part extends in a first direction away from the flange portion and has a first surface. The second extending part extends in a second direction away from the flange portion and has a second surface. A second included angle is formed between the first extending part and the second extending part. When theelastic piece is arranged in front of the frame body, the second included angle is larger than the first included angle; when the elastic piece is arranged on the frame body, the flange part is clamped with the corner part,