step (a) producing a noodle band from a noodle dough prepared by adding an edible oil to a noodle dough material containing a raw material flour, and then producing raw noodle strands from the noodle band, step (b) adhering an edible oil to the raw noodle strands, and then steaming the raw noodle strands to produce steamed noodles, step (c) forming a noodle block by packing a predetermined amount of the steamed noodles into a retainer, and step (d) swelling and drying the noodle block by blowing a hot air stream at a temperature of 120°C to 160°C onto the noodle block from above and below the retainer at a stream speed of 30 m/s to 70 m/s for a period of 3 to 15 minutes.
