To provide a method for manufacturing a cold-coiled wire rod of high quality for a spring, which acquires opposing properties of having a reduced amount of a decarburized surface layer but being soft in material quality.

This manufacturing method includes the steps of: coiling a hot-rolled wire rod 14; spreading it on a conveyer 18; and cooling it while transporting it. The cooling step comprises: (a) a quenching step P4 of quenching the wire rod 14 to a temperature in the vicinity of the eutectic transformation point; and (b) a slow-cooling step P5 of slowly cooling the quenched wire rod 14 in the quenching step P4 at a cooling rate lower than that in the quenching step P4. Thus obtained cold-coiled wire rod 14 of high quality for a spring acquires the opposing properties, that are the reduced amount of the decarburized surface layer and the soft material quality, because the rolled wire rod 14 quickly passes through a decarburization region in between an A3 line and an A1 line (eutectic transformation temperature) to minimize the precipitation of ferrite, namely, the formation of the decarburized surface layer, and is slowly cooled in the slow-cooling step P5 to be sufficiently softened and enhance workability at ordinary temperature.