An illuminated keyboard includes plural keys, a base plate, an illumination module, plural light guide tubes, and at least one optical coupling element. The illumination module is used for emitting plural light beams. The plural light guide tubes are arranged between the plural keys and the base plate for guiding the light beams to the plural keys. The optical coupling element is arranged between the illumination module and the plural light guide tubes for guiding the light beams to the plural light guide tubes. In such way, the illuminated keyboard can be illuminated.