To suppress the drop of operating efficiency (productivity) by rapidly executing caliber changing in each rolling mill with respect to rolling equipment for steel bar or the like.

Adjacent horizontal rolling mill 1A and vertical rolling mill 1B are respectively composed of stands 5, 8, transmissions 6, 9 and driving parts 7, 10 and can be connected and disconnected between the stands 5, 8 and the transmissions 6, 9. The stands 5, 8 are placed on a moving table 12. On the side part of the pass line, floor rails 16 for putting in and out the moving table 12 are arranged and two routes of retreating lines 16C, 16D are arranged on the floor rails 16 through a turning part 16B. A spare moving table 12S is made to stand by on the retreating line 16C on one side and the caliber changing is executed in the stands (the stands corresponding to 5, 8) which are placed side by side on this moving table 12S. At the time of actually changing the caliber, the moving tables 12, 12A are changed each other.