Manufacturing method of tube-attached coupling structure and tube-attached coupling structure

A manufacturing method of a tube-attached coupling structure in which a connection tube is attached to a base body having an attaching hole, the method comprising the steps of:

• preparing a photocurable gel-like body in a hollow cylindrical shape;
• fitting the photocurable gel-like body into the attaching hole;
• inserting an end portion of the connection tube into a hollow hole of the photocurable gel-like body;
• and
• curing the photocurable gel-like body by irradiating the photocurable gel-like body with light,
• wherein the step of preparing the photocurable gel-like body includes producing the photocurable gel-like body in the hollow cylindrical shape by pouring a solution of a photocurable gel-like body before gelation into a molding die,
• the solution contains a polyfunctional urethane (meth) acrylate and a photopolymerization initiator, the solution is heated after being poured into the molding die to form the hollow cylindrical photocurable gel-like body, and
• the hollow cylindrical photocurable gel-like body obtained after molding and heating has elastic self-moldability before photocuring and is capable of expanding outward to fit the inner wall of the attaching hole after inserting the connection tube.