To provide a method for producing ductile cast iron (spheroidal graphite cast iron) having excellent impact resistance, particularly, at low temperature without performing heat treatment.

In the method for producing ductile cast iron, the content of C is controlled to 3.5 to 3.7 wt.%, the content of Si is controlled to 2.3 to 2.5 wt.%, and the content of Mn is controlled to ≤0.25 wt.%, and the ratio of pearlite is controlled to ≤20%. Further, the addition of an inoculum is performed several times before tapping. In its compositional structure, the number of graphite grains with a diameter of ≥5 μm is controlled to ≥450 pieces/mm2. In the blending ratio of the material, pig iron is used by 40%.