PROBLEM TO BE SOLVED: To provide a catheter that can increase the operability thereof in a blood vessel during manipulation.SOLUTION: A catheter 1 includes a guide wire sheath 10 serving as a hollow body for passing a guide wire 20 serving as a guiding linear member through a tip part 6 of a catheter sheath 2. In the tip part 6 of the catheter sheath 2, MR fluid 50 is disposed to increase rigidity of the tip part 6. The MR fluid 50 is solidified by a magnetic field.SELECTED DRAWING: Figure 2COPYRIGHT: (C)2016,JPO&INPIT【課題】手技を行う時に血管内での操作性を向上できるカテーテルを提供する。【解決手段】カテーテル1は、カテーテルシース2の先端部6にガイド用の線状部材としてのガイドワイヤ20を通すための中空体としてのガイドワイヤシース10を有し、カテーテルシース2の先端部6には、先端部6の剛性を上げるためのMR流体50が配置され、MR流体50は磁場により固体になる。【選択図】図2