An illumination apparatus for a drink holder that includes a base portion having a planar top surface attachable to a bottom surface of the drink holder, a lighting device disposed at an exterior bottom surface of the base portion, to supply light in a downward direction away from the drink holder, and a circuit enclosed by the base portion at a predetermined distance from the planar top surface of the base portion. The circuit includes a power supply unit to supply power for operation of the lighting device, a light driving unit electrically connected with the power supply unit and the lighting device, to regulate power supplied to the lighting device, and a switch device configured to switch the illumination apparatus between an on-state and an off-state.