While preventing leakage of liquid during clamping can be a sealing area with a minimum to provide a clamping device of a flexible tube that can be easily unclamped.
One end portion 2 of the first protrusion 5 is formed, includes the other end portion 3 of the second protrusion 6 facing the first protrusion 5 is formed, an intermediate portion 4, an engagement portion 3a When the end portion 2 while deflecting the intermediate section 4 is engaged with the engaging portion 3a of the flexible tube C at the insertion state between the first protrusion 5 and the second protrusion 6, first the convex portion 5 adjacent the second projection 6 clamps the flexible tube C, and the clamping device 1 of flexible tubing for blocking the flow of fluid at the site, the one end portion 2 engaging portion 3a engaged with the by a flexible tube C whilst clamped, relative positioning the fitting portion 8 and the fitting can be of the first protrusion 5 and the second protrusions 6 with respect to the longitudinal direction of the flexible tube C parts 5a are those provided with the.