Stopper of vessel

One piece or two or more pieces of closures of a container comprising:

• a closure body detachably coupled at an inlet of a container;
• and a sealing member provided at the closure body and sealing the inlet of the container or the closure body as a hemispherical region descends by a pressing method, wherein a cutting support 41 is installed inside a thin connection film 33 of the closure (Refer to a principle presented in a Waveform annular body and Cap(B) described with reference to FIG. 1 of Japanese Application No. Sho 57-126367 entitled ‘Cap’ filed on Feb. 3, 1981 by the applicant of DAINIPPON INK AND CHEMICALS, INC., a former patent application), a structure having a new function such as a sealing member keeping recess 43 and a cutting blade 44 are installed at the cutting support 41, and such a principle that a sealing member 2 sealed at the inlet of the container is penetrated by a cutting blade 42 of the closure, slit by the cutting support blade 44 and then inserted in the sealing member keeping recess 43 for storage is applied.