To manufacture a metallic bar material or a metallic wire material having a cross sectional area of 5.5 mm or smaller diameter likewise by means of the hot rolling means in the quantatively same condition but in a lower rolling speed.

Specified number of vertical rolling roll pairs are installed dividedly in at least two lines 61, 62 in the vertical rolling means 6. Respective vertical rolling roll pairs of the first line 61 are arranged in the deviated manner from the vertical rolling roll pair of the nearest second line 62 and one of a wire like material/a bar material/a wire is rolled by means of the first line 61 of vertical rolling roll pair and the second wire like material/bar material/ wire located in the nearest position is guided along the side of the vertical rolling roll pair of the first line 61 and rolled by the corresponding vertical rolling roll pair arranged in a deviated manner in the second line 62.