PURPOSE: To roll a wire rod of high accuracy at a high speed by using many caliber rolls and arranging a mechanism for adjusting roll parting and mechanism for driving total roll side by side.

CONSTITUTION: By revolving an adjusting shaft fine adjustably, the center (b) of an eccentric shaft 8 is moved along a circular arc of which the center is a point (a), accordingly, the center of the caliber roll 4 and driven bevel gear 6 are eccentrically moved. In this manner, the center axial line of the caliber roll 4 is radially moved to the pass line L and parting adjustment is executed. The bevel gear and key are fastened to the ends of both shafts in the neck part of each eccentric shaft 8, respectively meshed with the bevel gear of the eccentric shafts which are vertically adjacent, all of other eccentric shafts 8 are synchronously revolved in fine adjustable by the fine adjustable rotation of one of the eccentric shafts 8 and all caliber rolls 4 are simultaneously and slightly moved in the radial direction to the pass L.