| 摘要 |
A barrier unit, of which the cap edge is not easily deformed even under some external force, is provided. The barrier unit includes: a base, which defines a first window; a cap, which defines a second window and which is arranged so that the second window faces the first window; and at least one blade, which is arranged between the base and the cap so as to open or close with respect to the first and second windows. A surface of the cap that is opposed to the at least one blade has a notched portion around the second window.
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