| 摘要 |
PROBLEM TO BE SOLVED: To simplify fitting and removing operation for a cover of a container with the cover and improve the sealing properties of the cover with the container. SOLUTION: A container is provided with a flange section around an opening, a sealing sheet adhering to the flange section and sealing the opening and a cover fitted on the flange section and covering the sealing sheet, and the cover is constituted of a stopper brought into contact with the sealing sheet and fixing the position of the cover on the container and an elastic section encircling the periphery of the container in the vicinity of an area including the flange section of the container, and the elastic section is provided with a first recess to be fitted on the flange section in the state of being positioned by the stopper and a second recess to be fitted on the flange section positioned inside the first recess and fitted on the flange section after the sealing sheet is removed and the container is unsealed, and the sealing properties of the container is improved by the joint working of the second recess and the stopper.
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