Abstract: A quick change device for an oscillating tool that can be attached to the vibratory unit of a vibration welding machine. The quick change device comprises several clamp bodies, through which a vibratory plate of the vibratory unit and a tool plate of the tool are connected with each other in a force-fit manner. The clamp bodies are mounted in a movable manner on the machine frame or on the vibratory unit in order to be able to be displaced between clamping and opening positions for closing or opening the force-fit connection. According to a preferred embodiment, the actuating devices are made up of screws, which serve to both tighten and release the clamp bodies as well as to ensure the force-fit connection.