A catheter having a catheter shaft in which a distal shaft and a proximal shaft are integrated with high joint strength is provided. The catheter has a proximal proximal shaft 30 formed in a hollow shape and a distal distal shaft 40 formed in a hollow shape in an axial direction. The shaft 40 is integrated by inserting one end portion into the hollow interior of the other end portion, and the proximal shaft 30 has a through portion 32 penetrating between the inner surface and the outer surface at the end portion. The distal shaft 40 has a projecting portion 45 that penetrates from one surface of the proximal shaft 30 to the other surface through the penetration portion 32, and the tip portion of the projection 45 closes through the penetration portion 32. The catheter shaft 11 is exposed on the inner or outer surface of the positioning shaft 30.遠位側のシャフトと近位側のシャフトとが高い接合強度で一体化されたカテーテルシャフトを有するカテーテルを提供する。このカテーテルは、それぞれ中空状に形成された近位側の近位シャフト３０と、中空状に形成された遠位側の遠位シャフト４０とを軸方向に接合し、近位シャフト３０と遠位シャフト４０は、一方の端部が他方の端部の中空内部に挿入されて一体化され、近位シャフト３０は、端部に内表面と外表面との間を貫通する貫通部３２を有し、遠位シャフト４０は、貫通部３２を通じて近位シャフト３０の一方の表面から他方の表面に向かって貫通する突状部４５を有し、突状部４５の先端部は、貫通部３２を通じて近位シャフト３０の内表面または外表面に露出するカテーテルシャフト１１を有する。
