Provided are a catheter and a method for manufacturing a catheter that can satisfactorily maintain the bonding strength of resin materials having different hardnesses on the distal side and the proximal side, and can effectively suppress peeling of the bonded portion. An inner catheter (30) used in conjunction with the guiding catheter (20), which is detachably disposed in the lumen of the guiding catheter (20), and is a distal tube portion made of resin ( 71) and a proximal tubular portion made of a resin having a hardness higher than that of the distal tubular portion (71) and having a distal end connected to a proximal end of the distal tubular portion (71) (72), and the distal end of the proximal tubular portion (72) gradually decreases in outer diameter toward the distal side and radially inward of the distal tubular portion (71). A taper portion (75) located on the distal end and a sheath projecting from the proximal portion of the taper portion (75) toward the distal side and surrounding the radially outer side of the proximal end portion of the distal tubular portion (71) The distal tubular portion (71) has a wedge portion (77) sandwiched between the tapered portion (75) and the covering portion (76). Having.遠位側と近位側で硬度が異なる樹脂材料の接合強度を良好に維持でき、接合部の剥離を効果的に抑制できるカテーテルおよびカテーテルの製造方法を提供する。 ガイディングカテーテル（２０）の内腔に引き抜き可能に配置されて当該ガイディングカテーテル（２０）とともに使用される内カテーテル（３０）であって、遠位側に位置する樹脂製の遠位管状部（７１）と、遠位管状部（７１）よりも硬度が高い樹脂製であり、遠位側の端部が遠位管状部（７１）の近位側の端部に結合された近位管状部（７２）と、を有し、近位管状部（７２）の遠位側の端部は、遠位側へ向かって外径が徐々に減少して遠位管状部（７１）の径方向内側に位置するテーパ部（７５）と、テーパ部（７５）の近位側の部位から遠位側へ向かって突出して遠位管状部（７１）の近位側端部の径方向外側を囲む被覆部（７６）とを有し、遠位管状部（７１）は、テーパ部（７５）および被覆部（７６）に挟まれる楔部（７７）を有する。
