| 摘要 |
PURPOSE: A bottle cap capable of easily opening and closing with small amount of power is provided to improve the sealing force of the bottle cap on a bottle. CONSTITUTION: A bottle cap(10) includes an extension unit(11) for an action point of the rotation with the action point located on the outside of an opening end(1a). The action point of the rotation on the bottle cap is plural rotational operating surfaces expand-protruded from the outer circumference of the bottle cap, or plural rotational operating surfaces expand-protruded from the upper side of the bottle cap.
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