| 摘要 |
The present invention relates to a bottle cap comprising: an insertion part configured to be fitted into the inner circumference of the slider for blocking the inner circumference of the slider; a sealing ring configured to be extended at a lateral side of a lower end of the insertion part for sealing the lower end of the slider; an extension pipe configured to be extended to the lower side of the sealing ring and having at least one shrinkage inducing groove cut lengthwise on the extension pipe such that a diameter of the extension pipe is decreased by an outside pressing force; and a hook protruding from the outer side of the extension pipe in an outward direction from the extension pipe so as to be engaged with the bottom surface of a locking protrusion on the inner circumferential side of the end portion of the inner cap.
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