To provide a manufacturing method of an extra fine bar capable of easily manufacturing the extra fine bar at a low cost.

In an extra fine deformed bar manufacturing method, a hole 1a approximately same in diameter as a valley part 10a to be obtained, is formed in a steel plate 1. A plurality of sets of hole dies 2 (upper die) and a hole die 3 (lower die) formed by splitting the steel plate 1 into two pieces at the diameter position of the hole 1a formed in the steel plate 1, are arranged with the prescribed intervals, and a wire 10 to be fed by the hole die 2 and the hole die 3 is pressed in a holding manner to obtain the deformed shape.