Tube end member, flange tube, band joint structure for flange tube, and method for manufacturing tube end member

A tube end member to be provided at an end of a flange tube, the tube end member comprising:

• a tubular part configured to be fitted to an end of a tube body of the flange tube;
• a flat part formed by bending an end of the tubular part outwards at a substantially right angle, in an opposite side to a fitting side of the tubular part to be fitted to the tube body;
• an extending part formed by bending an outer end of the flat part at a substantially right angle towards the tubular part;
• a tapered part extending at an angle from an edge of the extending part so as to approach the tubular part;
• and
• a folded-back part folded back from an edge of the tapered part into a space enclosed by the tubular part, the flat part and the extending part, wherein
• an edge of the folded-back part abuts on the tapered part so as to urge the tapered part outwards,
• wherein the extending part has a flat surface.