Mechanical component, mechanical component manufacturing method, movement, and timepiece

A method of manufacturing a mechanical component rotating around a shaft member,

• the mechanical component comprising:
• a component main body having a through-hole through which the shaft member is passed;
• and
• one or a plurality of shaft support portions formed on the inner surface of the through-hole and serving to fix the shaft member to the component main body,
• with the shaft support portion(s) protruding into the through-hole from the inner surface of the through-hole and capable of retaining the shaft member due to an elastic force,
• the elongation percentage of the shaft support portion(s) being larger than the elongation percentage of the component main body,
• the method comprising the steps of:
• forming a mask having an inner configuration corresponding to the configuration of the shaft supporting portion(s) and an outer configuration corresponding to the outer configuration of the component main body on at least one surface of a base member constituting the component main body and forming a structure for retaining the shaft support portion(s) on the base member in conformity with the inner configuration of the mask;
• forming the shaft support portion(s) formed of the material through electroforming;
• and
• removing unnecessary portions of the base member in conformity with the outer configuration of the mask.