The invention relates to a trailer coupling (1) for fastening to a towing vehicle, having a flange plate (2) and a hitch ball (3), wherein a neck (4) that connects the flange plate (2) and the hitch ball (3) is formed. For a high force load capacity, small installation space requirements, weight efficient constructability and assurance of large swivel angles, it is suggested, that the maximal extent of the neck (4) in a first direction (91) is smaller than in a second direction (92), which is normal to the first direction (91).