Locally illuminated keycap

A locally illuminated keycap located in a keyboard which includes a command circuit board that is located beneath the keycap and triggered by a vertical movement of the keycap to issue a keyboard command signal, and a lighting unit providing light and projecting the light to the keycap, comprising:

• at least one top edge to form an opaque press surface, at least one bottom edge located below the press surface to form a light incident surface to receive the light, and at least one transparent light emitting surface connecting to the top edge and the bottom edge to emit light;
• wherein the light emitting surface is located between the press surface and the light incident surface, the press surface and the light emitting surface forming an inclined angle therebetween greater than ninety degrees, the press surface, the light incident surface and the light emitting surface jointly forming a light retaining zone, the light generated by the lighting unit entering the light retaining zone and being masked by the opaque press surface to emit locally through the transparent light emitting surface.