To provide a smelting reduction and decarburizing equipment for continuously producing a steel by efficiently decarburizing molten iron produced from iron raw material in a smelting reduction furnace while lowering the energy loss, with a simplified steel producing equipment.

In the equipment for directly producing the molten iron 7, iron raw material, carbonaceous material and slag-making material are added into the furnace body 1, and pure oxygen and/or oxygen-enriched gas are blown and then, the molten iron 7 is stored in the bottom part of the furnace body 1 and slag 8 having smaller sp. gr. than the molten iron 7 at the upper part of the molten iron, and the molten iron 7 from an iron tapping hole 11 through a molten iron pool part 9 and the slag 8 from a slag tapping hole 12, are continuously or intermittently discharged. In such a case, an oxygen lance 19 is arranged at a roof or a side surface of the molten iron pool part 9.