| 摘要 |
A case capable of airtightly closing an opening of a mouth of a case body by screwing a lid on the case body; and rotating the lid smoothly in the circumferential direction when the lid is screwed on or unscrewed from the case body. The case including a case body having a mouth, and a lid detachably screwed on the mouth so as to close an opening of the mouth and connected to the case body via an opening and closing hinge so as to pivot in directions of opening and closing the mouth is provided with a rotary ring fitted and held around the mouth so as to rotate in a circumferential direction thereof and connected to the lid via the opening and closing hinge so that the lid rotates together with the rotary ring.
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