Light-penetration key

The invention relates to a light-penetration key which comprises a light-penetration key body, an electronic switch arranged below the key body and a luminous body, wherein the luminous body is arranged on one side below the key body. A light conductor arranged below the key body is provided with a main body, and an extension part extends from the upper lateral surface of the main body to the place at which the electronic switch is arranged. The outer surface of the extension part is a first reflection inclined surface, and the lower surface of the main body comprises a second reflection inclined surface and a light inlet part, wherein the second reflection inclined surface is also used as a lightly-touch surface touched with the electronic switch, and the light inlet part is connected with the extension part and arranged corresponding to the luminous body. The luminous body emits light to the first reflection inclined surface through a leading-in part, then the light is reflected to the main body by the firs