Abstract: An object of the present invention is to provide a keyboard input device and a method of selecting a color of a key that can use existing key color setting without installing a drive program even when a connected unit such as a computer, an IPTV, or a set-top box is replaced. In order to achieve the object, a keyboard input device according to the present invention includes a plurality of keys that is made of a transparent material and connected to a computer, an IPTV and the like. The keyboard input device includes light-emitting elements that are provided below the plurality of keys and each include a plurality of LEDs for illuminating upper surfaces of the keys, a microcomputer that controls the colors of the light-emitting elements by controlling the plurality of LEDs, and a color adjusting unit that is connected to the mi- crocomputer and adjusts the colors of the keys by adjusting the colors of the plurality of LEDs.