To simplify assembly work and clearly display a sales state by directly forming a display part comprising a light transmitting part in which required characters and graphics are modeled and a shading part in the front part of an elastic member or the rear part of a key top.

A display part 50 is constituted with a light transmitting part installed in a portion facing a lightguide part 5d and a shading part 50b in other portions. The shading part 50b is made of a covering layer 51 installed with an opaque sheet stripe film material or a printing means, and the light transmitting part 50a is a part where the covering layer does not exist along the required characters and graphics such as a mark '0' sowing being available or 'Sold out'. Emission from a light source shaded with the lightguide part of an elastic member is shaped in contours such as the required characters or graphics, and transmitted through the light transmitting member 50a, and in lighting, a display relating to a push button switch clearly emerges.