A backlight module including a frame, a reflective adhesive tape, a fixing adhesive tape, a reflective plate, a light-guiding plate and at least one of light source, is provided. The frame has a groove at one side. The reflective adhesive tape is disposed in the groove. The fixing adhesive tape is disposed at the side of the frame, and is disposed on the reflective adhesive tape. The reflective plate is disposed in the frame, wherein a gap is formed between the reflective plate and the fixing adhesive tape, and the gap is above the reflective adhesive tape. The light-guiding plate is disposed in the frame, and is disposed on the reflective plate and the fixing adhesive tape. The light-guiding plate has at least one light-incident surface. The light source is disposed beside the light-incident surface of the light-guiding plate. The backlight module is adapted for providing uniform surface light source.