Abstract: An illuminated safety belt buckle, especially for a motor vehicle, having a buckle housing and a key to actuate a securing device that is disposed in the housing. When an associated buckle tongue is inserted into the insertion slot formed in the housing, the securing device interlocks with the tongue. To provide illumination for the key and the insertion slot, a single light source is disposed in the buckle housing beyond these functional components. A light-conducting path of light-conducting material couples the light source with the key and the insertion slot.