PROBLEM TO BE SOLVED: To provide a catheter assembly which is high in flexibility and has an end part having X-ray contrast properties.SOLUTION: A catheter assembly 1 has an external catheter 2 having a long tubular outer shaft 3 and an internal catheter 5 having an inner shaft 6 that can be inserted into an internal cavity of the outer shaft 3. The external catheter 2 has an outer shaft radiopaque part 25 having X-ray contrast properties at an end part of the outer shaft 3 and has a soft part 26 lower in X-ray contrast properties than the outer shaft radiopaque part 25 on a base end side of the outer shaft radiopaque part 25. The inner shaft 6 of the internal catheter 5 has an inner shaft radiopaque part 41 having the X-ray contrast properties. The inner shaft radiopaque part 41 exists in an area overlapping the soft part 26 in at least a length direction in the state that the inner shaft 6 is inserted into the inner cavity of the outer shaft 3.SELECTED DRAWING: Figure 6【課題】柔軟性が高く、かつ、Ｘ線造影性も有する先端部を有するカテーテル組立体を提供する。【解決手段】長尺管状の外シャフト３を有する外カテーテル２と、外シャフト３の内腔に挿通可能な内シャフト６を有する内カテーテル５と、を有し、外カテーテル２は、外シャフト３の先端部にＸ線造影性を有する外シャフト造影部２５を有すると共に、外シャフト造影部２５より基端側には、外シャフト造影部２５よりＸ線造影性が低い柔軟部２６を有し、内カテーテル５の内シャフト６は、Ｘ線造影性を有する内シャフト造影部４１を有し、内シャフト造影部４１は、内シャフト６を外シャフト３の内腔に挿通させた状態で、少なくとも長さ方向において柔軟部２６と重なる領域に存在するカテーテル組立体１である。【選択図】図６
