Joint component manufacturing method

A joint component manufacturing method for joining a first member and a second member by fitting of a shaft portion of the second member in a hole of the first member, the first member and the second member each including a weak press-fit portion at a tip end portion, the tip end portion of the first member and the tip end portion of the second member first fitted to each other upon fitting between the hole and the shaft portion, and the first member or the second member including a strong press-fit portion formed to protrude to a far side of the tip end portion, the method comprising:

• a first weak press-fit step of press-fitting the weak press-fit portion of the first member and the weak press-fit portion of the second member in a non-current-application state;
• and
• a first strong press-fit step of press-fitting the strong press-fit portion and either one of the weak press-fit portion of the first member or the weak press-fit portion of the second member in a state in which electric resistance heat is generated between the first member and the second member by applying a current,
• wherein a first weak press-fit interference, which is a thickness of an overlapping portion upon fitting between the weak press-fit portion of the first member and the weak press-fit portion of the second member, is thinner than a first strong press-fit interference, which is a thickness of an overlapping portion upon fitting between the strong press-fit portion and either one of the weak press-fit portion of the first member or the weak press-fit portion of the second member.