PURPOSE: To provide a method of forming a round cross section in a prescribed finish dimension, in rolling a stock, and a roll stand group for carrying out this method.

CONSTITUTION: In the case where a reduction rate of area is 14-28% in a first roll stand, the rolling speed of the roll stands is set so that only a slight tensile force is produced; in the case where a reduction rate of area is adjusted to be 1-5% in the last roll stand, a motive force is controlled for the driving mechanism of this roll stand so that no reduction of area is performed for the rolling stock between this roll stand and the preceding one. The motor 8 for driving the first and second roll stands 1, 2 together and the motor 9 for driving the third roll stand 3 are designed to drive under an adjustment restriction of the electric current.