An illuminated pushbutton switch including an elongated housing, a switching component accommodated within the housing, an actuating component coaxially housed in the housing for actuating the switching component in response to an external force, and an illuminating component for lightning an upper portion of the actuating component, said illuminating component comprising a lead frame, a pair of light emitting devices arranged on the lead frame, and an optically transparent member including a pair of transparent blocks corresponding to and embedding the light emitting devices, each of said blocks including a lens portion having an upper flat square surface and a nearly reverse conical side wall portion in which the light emitted from the corresponding one of the light emitting devices is defracted to radiate uniform light beams from the upper flat square surface, the upper flat square surface of the blocks constituting a continuous flat surface.