PROBLEM TO BE SOLVED: To provide a joining structure that further increases bonding strength including bonding strength against pressure in a radial direction, and a catheter having the same.SOLUTION: In a structure for joining a tubular element 3 made of a resin and a tubular element 5 made of a resin, a joint area between the tubular elements 3 and 5, which assumes an uneven shape in a major axis direction along a circumferential direction, is formed in such a shape that either of the tubular elements 3 and 5 gets into an area except both ends of the other tubular element, in a cross-sectional view.SELECTED DRAWING: Figure 2COPYRIGHT: (C)2018,JPO&INPIT【課題】 放射方向の圧力に対する接合強度の向上を含めてさらに接合強度を向上させた接合構造及びその接合構造を有するカテーテルを提供する。【解決手段】 樹脂からなる管状部材3と樹脂からなる管状部材5との接合構造において、管状部材3と管状部材5との接合面は、円周方向に沿って長軸方向に凸凹形状を呈しており、断面視において、管状部材3及び管状部材5の何れか一方の管状部材が、他方の管状部材に、その他方の管状部材の両端以外の領域において入り込むように形成されている。【選択図】図2
