Abstract: A coupling device for releasably attaching accessories to a bicycle, with a coupling part which is fastened or can be fastened to the accessory and has a retaining section which can be coupled on by being pushed in, and with a coupling unit designed for receiving the retaining section, is permanently integrated on the bicycle or is fastened to the bicycle by a connection element and has a receiving section for pushing in the retaining section. Various optional and uniform coupling options are obtained by coupling units, each identical, being permanently integrated at a plurality of points on the bicycle, or by provision of differently designed connectors with which separate coupling units can be equipped and can be attached to different points on the bicycle, and by the coupling parts configured so that they are attached or can be attached to various types of accessories.