A backlight module comprising a light guild plate, at least one lamp, a lower frame, at least one turning holder, a locating block and an upper frame is provided. The lower frame is used for carrying the light guild plate and the lamp. The light guide plate has light incidence planes and light emergence planes, and the lamp is disposed beside at least a part of the light incidence planes. The lamp has at least one turning angle, and the turning holder covers the turning angle of the lamp. The locating block is disposed on the turning holder, and the upper frame is disposed on the lower frame and exposes the light emergence plane. The upper frame has a locating opening, and the locating block is embedded in the locating opening. The backlight module provides three-dimensional preservation to preserve the lamp from the damage caused by external impact.