The present invention relates to an illuminated switch assembly that includes a case; a circuit board disposed inside the case; a light-emitting diode mounted on the circuit board to emit light downward; a light-guiding member configured to transmit the light emitted downward by the light-emitting diode to a position above the circuit board; and an operation member disposed in an upper part of the case to be operable as a switch, the operation member being configured to be illuminated with light received from the light-guiding member.