To supply two or more wire rods or round bars of iron or ferrous alloy to a construction machine of bending/forming machine and to compensate elongation of two or more rods or round bars.

This device is constituted so that a pair of opposed rolls 12 of an upper roll 12a and a lower roll 12b respectively regulates the pass 17 between passing wire rods and respective cooperating inner 17a/outer 17b of each roll, at least one roll 2a of the opposed rolls substantially moves on the plane including the axis of the opposed rolls 12 in parallel to itself. Respective shafts 15a, 15b are inserted into a support part 13 consisting of an upper support 13a and a lower support 13b respectively, by these, the other roll 12b is moved on the plane including the axis of the opposed rolls 12 at a controlled rocking state and is controlled by an adjustment means 33 including a bottom positioning screw means 23 and a spring means 33.