Patent ID: 7392680

Claim:
A rolling die comprising: a thread rolling die for forming a thread or a worm by rolling onto a first rolled portion of a shaft member coaxially having the first rolled portion and a second rolled portion; and a spline rolling die for forming a spline having a small number of teeth whose number is thirteen or less onto the second rolled portion of the shaft member by rolling, wherein the thread rolling die and the spline rolling die are disposed parallel to each other, pitches of a set of teeth of the spline rolling die are set in accordance with a circumferential length of a rolling diameter of the thread or the worm formed by rolling onto the first rolled portion of the shaft member by use of the thread rolling die, and cutting in the second rolled portion of the shaft member by use of the spline rolling die starts, when cutting in the first rolled portion of the shaft member by use of the thread rolling die is done so that a depth of the cutting in the first rolled portion reaches a value of five percent or more and ten percent or less relative to a blank diameter of the first rolled portion.