A horse driving harness (1) for attaching a pullable implement such as a sulky is disclosed, the harness being mountable on a horse's back and securable thereto with the help of straps (2) and the driving harness incorporating a hitch device (5) adapted on the sides of the harness facing both flanks of the horse for hitching the sulky shafts to the harness. According to the invention, the mounting of the hitch device (5) to the harness (1) is implemented with the help of a ball joint, whereby the hitch device is freely rotatable relative to the harness within the constraints of the ball joint.