A method for producing a molten steel using a solid-state direct reduced iron as a raw material, wherein: the solid-state direct reduced iron contains 3.0% by mass or more of SiO 2 and Al 2 O 3 in total and 1.0% by mass or more of carbon, a ratio of a metallic iron to a total iron content contained in the solid-state direct reduced iron is 90% by mass or more, and an excess carbon content Cx specified by the following formula to the carbon contained in the solid-state direct reduced iron is 0.2% by mass or more, the method comprising: a slag separation step in which the solid-state direct reduced iron is heated and melted in an electric furnace without introducing oxygen to separate into a molten steel and a slag, and the slag is continuously discharged from the electric furnace, and a decarburization step of blowing, in the electric furnace, a total amount of oxygen introduced into the electric furnace to the molten steel to decarburize after the slag separation step, wherein the decarburization step is started when 50% to 80% of a total time for performing the slag separation step and the decarburization step has elapsed from a start of the slag separation step, wherein the time for performing the slag separation step and the time for performing the decarburization step is determined according to the total content of SiO 2 and Al 2 O 3 contained in the solid-state direct reduced iron: Cx = C − FeO × 12 ÷ 55.85 + 16 ÷ 0.947 in the formula, Cx: excess carbon content, in mass%,: carbon content of solid-state direct reduced iron, in mass%, [FeO]: FeO content of solid-state direct reduced iron, in mass%. the solid-state direct reduced iron contains 3.0% by mass or more of SiO 2 and Al 2 O 3 in total and 1.0% by mass or more of carbon, a ratio of a metallic iron to a total iron content contained in the solid-state direct reduced iron is 90% by mass or more, and an excess carbon content Cx specified by the following formula to the carbon contained in the solid-state direct reduced iron is 0.2% by mass or more, the method comprising: a slag separation step in which the solid-state direct reduced iron is heated and melted in an electric furnace without introducing oxygen to separate into a molten steel and a slag, and the slag is continuously discharged from the electric furnace, and a decarburization step of blowing, in the electric furnace, a total amount of oxygen introduced into the electric furnace to the molten steel to decarburize after the slag separation step, wherein the decarburization step is started when 50% to 80% of a total time for performing the slag separation step and the decarburization step has elapsed from a start of the slag separation step, wherein the time for performing the slag separation step and the time for performing the decarburization step is determined according to the total content of SiO 2 and Al 2 O 3 contained in the solid-state direct reduced iron: Cx = C − FeO × 12 ÷ 55.85 + 16 ÷ 0.947 in the formula, Cx: excess carbon content, in mass%,: carbon content of solid-state direct reduced iron, in mass%, [FeO]: FeO content of solid-state direct reduced iron, in mass%. a slag separation step in which the solid-state direct reduced iron is heated and melted in an electric furnace without introducing oxygen to separate into a molten steel and a slag, and the slag is continuously discharged from the electric furnace, and a decarburization step of blowing, in the electric furnace, a total amount of oxygen introduced into the electric furnace to the molten steel to decarburize after the slag separation step, wherein the decarburization step is started when 50% to 80% of a total time for performing the slag separation step and the decarburization step has elapsed from a start of the slag separation step, wherein the time for performing the slag separation step and the time for performing the decarburization step is determined according to the total content of SiO 2 and Al 2 O 3 contained in the solid-state direct reduced iron: Cx = C − FeO × 12 ÷ 55.85 + 16 ÷ 0.947 in the formula, Cx: excess carbon content, in mass%,: carbon content of solid-state direct reduced iron, in mass%, [FeO]: FeO content of solid-state direct reduced iron, in mass%.