Rotary member and method for manufacturing same

A method for manufacturing a rotary member including an inner circumference and an outer circumference rotatable along a circumferential direction of the inner circumference and the outer circumference, comprising:

• a structure forming process of immersing carbon fibers in a dispersion in which carbon nanotubes having a bent shape with a bent portion are dispersed and to which ultrasonic vibration is applied to adhere the carbon nanotubes to the carbon fibers, thereby forming a structure having a network structure including a contact portion where the carbon nanotubes are in direct contact with each other on surfaces of the carbon fibers;
• a first sizing treatment process of causing the carbon fibers to come into contact with a first sizing treatment solution, after the structure forming process, to apply a first sizing agent which functions as an aqueous cross-linking agent, the first sizing agent cross-links and fixes the carbon nanotubes which are in direct contact with each other;
• and
• a molding process of applying a matrix resin to the carbon fibers in which the structure is formed, winding the carbon fibers applied with the matrix resin around a mandrel, curing the matrix resin, and pulling out the mandrel, after the first sizing treatment process,
• wherein, in the structure, a gap surrounded by the plurality of carbon nanotubes is formed, and the first sizing agent does not fill up the gap.