Abstract: A surface light-emitting unit installed on a floor or wall of a structure is able to emit light from its surface for unique illumination effects. A surface light-emitting unit includes a transparent glass plate that can transmit light; a light-conducting plate installed below the glass plate; a light-emitting means having multiple light-emitting diodes of different colors and installed on the side face of the light-conducting plate; a light-diffusing/reflecting member installed below the light-conducting plate that diffuses and reflects the light; an emission-color selection means for selecting the light-emitting diode to be illuminated or blinked; a casing for providing the transparent glass plate at the top opening; a casing for installing above components; and a connection part that can be connected to other surface light-emitting unit installed adjacently.