a signal lamp for vehicles has a reflector that acts to diffuse light from a light source within the lamp . the reflector is made up of multiple diffusing reflective elements having a reflecting region that reflects light emitted from the light source in a direction of an optical axis of the lamp . a lens is positioned in front of the reflector . the reflecting region of each diffusing reflective element is varied , such that an area ratio of the reflecting region for portions of the reflector with a high reflective illuminance is less than other portions having lower illuminance .