Touch key and controller

The utility model discloses a touch key comprising a touch screen, a light emitter and an inductor. The light emitter and the inductor are located under the touch screen, the light emitter emits light, the touch screen receives the light emitted by the light emitter, and the inductor receives the light reflected via the touch screen. The utility model further provides a controller. According to the utility model, problems, that a mechanical type key is short in service life and prone to fatigue damage and failure, are solved. The touch key with a light source is not affected by ambient light, and employs laser characteristics and diffuse reflection of light; and reliability is high.