Abstract: The invention describes a fifth-wheel coupling (1) having a fifth-wheel coupling plate (2) on which is arranged an entry opening (4) for a king pin (5). Provision is made of an at least single-part locking device (100) for fastening the king pin (5) and of a fixing element which engages on the locking device, which fixing element can be moved from a locking position into an open position and vice versa. In addition to the locking system, a securing device (15) with a blocking element (40, 400) is provided, which blocking element (40, 400) can be moved from a rest position into a blocking position and vice versa, wherein the blocking element (40, 400) projects into the entry opening (4) at least in the blocking position.