Rotary Connecting Structure, Rotary Connecting Tool, and Method for Configuring Rotary Connecting Structure

A rotary coupler comprising a hook member and a holder member, the hook member and the holder member being injection-molded from resin, wherein

• the hook member comprises a shaft formed irreducible in diameter,
• the holder member comprises a bearing portion formed unincreasable in diameter,
• the shaft is configured to rotate after being moved from a state where the shaft is contact-coupled to the bearing portion, and
• in a state where the shaft is rotatable with respect to the bearing portion, a gap in an axial direction of the rotary coupler between the hook member and the holder member is smaller than 0.5 mm.

A method of configuring a rotary coupling structure, the method comprising:

• injection-molding a primary molded product comprising a shaft from resin;
• after hardening of a surface of the primary molded product, injection-molding a secondary molded product from resin in such manner that a bearing portion is formed in a state of being contact-coupled to the shaft;
• and
• after hardening of the primary molded product and the secondary molded product, moving the shaft with respect to the bearing portion one time only to put the shaft into a rotatable state.