| 摘要 |
PURPOSE: A bottle cap is provided to confirm an opening state of a bottle continuously for a user without mutual interference of a screen and an inner cap, and to prevent making a forgery bottle with confidence using a sealing cap and an inner cap. CONSTITUTION: A bottle cap includes a sealing cap screwed in a bottle(10), an inner cap(110), a middle cap(120), and a screen(140). The inner cap is inserted inside the sealing cap, and includes a first rotation interference part and a first screen interference part. The middle cap has a second rotation interference part with a window. The screen has a second interference part and arranged inside the middle cap.
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