| 摘要 |
A bottle cap mounted on the opening of the bottle is provided, in which sealability is maintained in reuse after opening the bottle cap by forming the cap in a duplex configuration. A bottle cap comprises: a circumference part(11) which is formed in order to surround the outer circumference of the opening of the bottle; a first stopper(10) which is formed in the upper part of the circumference part in order to close an opening and includes a top unit(12) in which the groove portion(14) which caves in downward is formed; and a second stopper(20) which is fitted in the groove portion of the first stopper. The first holder(15) is formed in one side of the inner wall of the groove portion of the first stopper. The second holder(24) is formed in one side of the circumference of the second stopper.
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