PROBLEM TO BE SOLVED: To reliably close a passage by displacing a projection part of a clamp in a correct direction and suppressing deviation of the projection part.SOLUTION: A clamp 120 for closing a tube 190 includes: a support part 130 for supporting the tube 190 a projection part 140 projecting towards the support part 130 a deformation part 150 connecting the support part 130 and the projection part 140 and being deformed when the projection part 140 crushes the tube 190 and a positioning part 160 that is provided on an outer surface of the clamp 120 at a position overlapped with the projection part 140 and positioning a pressing member 112 of a closing device 100 to which the clamp 120 is mounted.SELECTED DRAWING: Figure 3COPYRIGHT: (C)2017,JPO&INPIT【課題】クランプの突出部を正しい方向に変位させて、突出部のずれを抑制し、確実に流路を閉鎖する。【解決手段】チューブ190を閉鎖するクランプ120は、チューブ190を支持する支持部130と、支持部130に向かって突出する突出部140と、支持部130と突出部140とを接続すると共に、突出部140がチューブ190を押し潰す際に変形する変形部150と、クランプ120の外面において突出部140と重なる位置に設けられ、クランプ120が取り付けられる閉鎖装置100の押圧部材112の位置決めをする位置決め部160とを備える。【選択図】図3