A keyboard module includes plural keys, a switch circuit board and a metallic bottom plate. The plural keys and the switch circuit board are disposed on the metallic bottom plate. The metallic bottom plate includes a first metal plate and a second metal plate. The first metal plate and the second metal plate are made of different metallic materials. Consequently, the metallic bottom plate has the two kinds of metallic characteristics. According to the consumer's requirements, the manufacturer of the keyboard module may select suitable metallic materials to produce the desired metallic bottom plate. Consequently, the metallic bottom plate will possess different functions.