Keyboard and keyboard set.

A keypad assembly (200) including: a keyboard (210) having a panel light guide (220), at least one key button (245) disposed on the upper surface (222) of the panel light guide ( 220), and at least one light emitting device (290), and a switch board (250) having at least one switch (265, 275) formed on its upper surface, which faces the keypad (210), characterized in that inside the panel light guide (220) light propagates through a side surface of the panel light guide (220) to another side surface of the panel light guide (220) opposite the first side surface , is formed locally at least one reflective pattern (230) on the light guide panel (220) to reflect a part of the propagated light towards the key button (245); the at least one light emitting device (290) is positioned to face the lateral surface of the light guide panel (220) and adapted to couple light into the light guide panel (220); and when the key button (245) is pressed, a portion of the keyboard (210) towards the switch board (250) activates the switch (265, 275) deforms.