PROBLEM TO BE SOLVED: To provide a production method of molten iron which can control calory in byproduct gas. SOLUTION: A coke packing layer 6 from the furnace bottom of a cylindrical furnace 1 to a level containing primary tuyeres 3 and a packing layer 7 of scrap, ore and solid shape industrial waste on this coke packing layer and further, the coke packing layer 6 thereon are alternately formed in plural layers. Assist combustible gas and fuel and/or powdery industrial waste are blown from the primary tuyeres 3 to execute heating reduction and melting. Further, at the time of producing the molten iron and slag by blowing the assist combustible gas from secondary tuyeres 4 to secondarily burn gas in the furnace, the secondary combustion ratio is controlled by adjusting the ratio of the assist combustible gas quantity in each tuyere, and the ratio of the assist combustible gas and the fuel and/or the powdery industrial waste in the primary tuyeres 3 is adjusted to control the calory of the byproduct gas. By this method, the flexible production of the pig iron and the byproduct gas can be executed. Then, the reductions of waste quantity and unit fuel cost are accomplished by effectively utilizing the iron, combustible material and ash in the industrial waste and also, the available byproduct gas can be obtd.