An embodiment of the invention provides a backlight module, comprising: a metal rear plate, comprising a bottom plate, a side edge structure and a bended structure; a light strip structure including a circuit substrate and a light source disposed on the circuit substrate; and an outer frame, wherein, the bended structure is provided with a first protruding structure extending toward the light strip structure, the bottom plate is provided with a second protruding structure extending toward the light strip structure, the circuit substrate of the light strip structure is fixed on the side edge structure by the first and second protruding structures, the side edge structure is provided with a first opening aligned with to the light source, the outer frame is provided with a second opening corresponding to the first opening.