A cross-roller bearing with plug, which has the high stiffness enough to allow the cross-roller bearing to turn with causing no jar or wobble, and also the production process to realize the cross-roller bearing with plug with ease and accuracy. With the cross-roller bearing with plug, more than one roller fills the space between the outside and inside races through a loading bore cut in any one of the races, and then a plug fits into the loading bore. The plug experiences cutting on its outside surface at the same time with the cutting of the circular outside surface of the outside race at once. The inside surface of the plug is also worked together with the cutting of the raceway surface around the inside circular surface of the outside race at a time.