Manufacturing method of base member of rotatable fixing member and manufacturing method of the rotatable fixing member

A manufacturing method of a rotatable fixing member comprising:

• (i) a manufacturing step of manufacturing a base member made of stainless steel;
• (ii) a forming step of forming a surface layer outside the base member manufactured by said manufacturing step,
• wherein said manufacturing step comprises,
• (ii-i) a first step of forming, from a first cup-shaped member made of a stainless steel and held at an inside portion thereof by a holding member, a second cup-shaped member made thinner than the first cup-shaped member by ironing an outside portion of the first cup-shaped member with a ring-shaped member movable in a longitudinal direction of the holding member,
• (ii-ii) a second step of extracting the second cup-shaped member out of the holding member, and
• (ii-iii) a third step of cutting a bottom end portion of the second cup-shaped member with respect to the longitudinal direction,
• wherein the first cup-shaped member has Vickers hardness of not less than 200 HV0.3/10 or more and not more than 280 HV0.3/10, and the holding member has Vickers hardness which is not less than four times and not more than nine times the Vickers hardness of the first cup-shaped member.