PURPOSE: To prevent reoxidation and sticking of reduced powder ore by specifying the partial pressure of carbon mono-oxide of a carrying gas used for discharging when powder ore is reduced in fluidized layer and is discharged.

CONSTITUTION: A fine iron ore is charged from a raw material supply port of fluidizing/reducing device to a riser 1, a reducing gas 9 is introduced from a nozzle of bottom of the riser 1 to form a fluidized layer, and reduction of fine rion ore is executed. The reduced iron ore is sent from the top part of riser 1 to a primary cyclone 2 together with discharge gas, and a caught iron ore is circulated from a primary downcomer 4 to the riser 1. At this time, the gas 23 for powder a part of iron ore is drawn to a bubble fluidized type pneumatic feeder 20 through a reduced ore-drawing tube 25 and a powder- carrying gas 23 including CO of which the partial pressure satisfies the equation (wherein P1: CO partial pressure (atm), P2: CO partial pressure (atm), T: temp. of reduced ore transfer device) is introduced, and the reduced iron ore 21 discharged from a discharge tube 22.