To provide a method capable of easily producing a screw stem while reducing assembling man-hours and preventing the deterioration of quality.

In a first process, a core material 18 having almost the same length as the stem material 12 is pressed into the inner part of the bar-like and hollow-state material 12, and in a second process, a rack part 14 and a screw part 16 are formed on the stem material 12 under state pressing the core material 18 into the stem material 12. In this way, it can be prevented that the stem material 12 is deformed and the deterioration of the quality in the stem material 12 caused by the pressure acted to the stem material 12 when the rack part 14 or the screw part 16 is formed. Further, since the rack part 14 or the screw part 16 is formed with one piece of the stem material 12, it is not necessary that the divided stem materials as the conventional technique are combined, respectively. In this way, the assembling man-hours of the screw stem 10 can be reduced and the screw stem 10 can easily be produced.