When precision cross roller bearings, because the divided inner or outer ring, rollers and the interval after loading the cage, and Cross-Roller Ring secured together to prevent separation from each other, so the installation Cross-Roller Ring simple operation. Since the roller is staggered, so only one set of Cross-Roller Ring can receive loads in all directions, as compared with conventional models, rigidity increased by 3 to 4 times. At the same time, because of the cross roller bearing inner or outer ring is constructed of two divided, bearing clearance adjustable, even if they are preloaded, can be obtained with high accuracy rotary motion.