Sealing structure and method of manufacturing the same

A method of manufacturing a sealing structure for sealing a through hole of a predetermined member, the method comprising:

• inserting a sealing member into the through hole, the sealing member including a cylindrically-shaped body part formed of a thin plate of a first thickness, one end of the body part being open and another end of the body part being closed, a tapered part with one end connected to the opened one end of the body part and including a diameter gradually expanding outward as a distance from the body part increases, and a cylindrical part connected to another end of the tapered part and including a cylindrical shape formed of a thin plate thinner than the first thickness;
• disposing a pressing jig on a distal end of the cylindrical part in the through hole;
• and
• pressing a distal end of the cylindrical part by the pressing jig while pressing or pulling the body part toward the cylindrical part to thereby buckle the cylindrical part outward and make a first bent part connected to the tapered part, formed of a thin plate thinner than the first thickness, so that a protruding part protruding outward elastically abuts against an inner peripheral surface of the through hole,
• the pressing jig is disposed so that the distal end of the cylindrical part is pressed against the inner peripheral surface of the through hole by the pressing jig, and
• by pressing or pulling the body part toward the cylindrical part, the cylindrical part is buckled outward, and the protruding part of the first bent part protruding outward elastically abuts against the inner peripheral surface of the through hole, and a distal end side of the first bent part is bent outward to form a second bent part that elastically abuts against the inner peripheral surface of the through hole and, wherein the second bent part is formed of a thin plate thinner than the first thickness.