<；P>；PROBLEM TO BE SOLVED: To solve the problem that administration of a specimen, collection of blood, etc. are not performed easily in a conventional catheter. <；P>；SOLUTION: The administration of a specimen, collection of blood, etc. are performed easily by a catheter which is provided with: a first flexible tubular member inserted to the inside of a living body and having first flexibility； a second flexible tubular member connected with the first flexible tubular member and having second flexibility larger than the first flexibility； and a third flexible tubular member connected to the second flexible tubular member and having third flexibility smaller than the second flexibility. <；P>；COPYRIGHT: (C)2010,JPO&INPIT
