It is without accompanying the troublesome conversion of process and the increase of production cost, to offer the catheter to which purpose of this invention improves the operativity when it keeps inserting the catheter from outside the body, decreases danger such as the damage of the shaft to remarkable at the same time regarding unexpected situation easily. In order at the same time for this invention being the rear end side shaft whose rigidity is high in comparison with the advanced side shaft and the aforementioned advanced side shaft which are formed from the resin make tube and the catheter which possesses the guide wire lumen at least, the advanced side shaft rear end side part to be hard in comparison with the advanced side shaft advanced side part and to become soft in comparison with the aforementioned rear end side shaft, the core wire which adjusts pliability is done distribution facilities, the catheter which features that the aforementioned core wire is adhered to the aforementioned advanced side shaft near the rear end side open part of the aforementioned guide wire lumen, in the one part of the aforementioned advanced side shaft rear end side part, was formed.本発明の目的は、体外からカテーテルを挿入していく場合の操作性を向上させ、且つ不測の事態においてもシャフトの損傷等の危険性を顕著に低減させたカテーテルを工程の煩雑化や製造コストの増大を伴わずに容易に提供することである。本発明は、樹脂製チューブから構成される先端側シャフト、前記先端側シャフトに比べて剛性が高い後端側シャフト、ガイドワイヤルーメンを少なくとも有するカテーテルであって、先端側シャフト後端側部分が先端側シャフト先端側部分に比べて硬く且つ前記後端側シャフトに比べて柔らかくなるように柔軟性を調整するコアワイヤが配設され、前記ガイドワイヤルーメンの後端側開口部付近と、前記先端側シャフト後端側部分の一部分において、前記コアワイヤが前記先端側シャフトに固着されていることを特徴とするカテーテルを構成した。
