To provide a hinge cap that has simple constitution, can open and close a container mouth part easily, and eliminates the need to finely adjust a rotation-directional position relative to the container mouth part, and is usable even for a container mouth part of a general article.SOLUTION: A hinge cap 100 has a cap body 110, and an upper lid 120 formed on the cap body 110 across hinges 130. The cap body 110 has a skirt wall 111 covering a circumference of the container mouth part C, and a female screw 112. The upper lid 120 is provided with an upper lid top face 121, an upper lid wall part 124, and a mouth part closing plug part 125. A lock piece 126 extending downward from the upper lid wall part 124 and a lock projection part 127 which is provided below the lock piece 126 and can engage...

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