Plug holder which can be attached to a trailer and assembly of a plug holder on a trailer

The plug holder (1) is attached to a supporter, and has a holding sleeve (3) provided with a gradual opening (4) for retaining different pin connector. A fixing device is provided for connecting at a trailer coupling. The fixing device has interlocking elements, which are integrally formed at the holding sleeve. The interlocking elements are formed as an elastically deformable locking hooks (5,6). The gradual opening has an insertion bevel (10). An independent claim is included for a plug holder arrangement.