Illumination device (20) for box-like or chest-like items of furniture having a body, which is provided with at least one door or flap, which can be pivoted between a closed position and an open position in relation to the body or a withdrawable part, for example a drawer or the like, which can be displaced between a closed position in which it is pushed into the body and an open position in which it is withdrawn from the body. The illumination device (20) has a holder, which can be connected to an electrical current source, for an illumination means (40), wherein a switch, which interrupts or opens the electrical connection in the event of a predetermined position of the door or flap or withdrawable part in relation to the body, is provided in the electrical connection between the current source and the illuminations means. The holder for the illumination means (40) has an adapter (32) having an adapter housing (34) which can be mounted in the body and in which a spring-prestressed pressure piece (36), which can be displaced between two separate positions and is in direct or indirect operative connection with the switch, is arranged. The adapter housing (34) is provided on one of the furniture fittings holding the door or flap or the withdrawable part movably on or in the body.