To provide a method of cooling rolled steel products by which a plurality of steel products rolled continuously successively by hot rolling or warm rolling are efficiently cooled down to the neighborhood of a low temperature range where inspection is performable without generating bends and the variation of quality.

This method of cooling the rolled steel products includes a naturally cooling step S1 where the plurality of long size steel products to which hot rolling or warm rolling is applied continuously are slowly cooled to temperature lower than a prescribed temperature at a cooling rate at which martensite transformation Ms or the like is not occurred, for example, and a rapid cooling step S2 where the plurality of above slowly cooled long size steel products are rotated along the radial (cross section) direction while being progressed along a direction orthogonally crossed with their axial directions and also cooling water is sprayed to such individual steel product.