| 摘要 |
PROBLEM TO BE SOLVED: To provide a synthetic resin cap which can be prevented from tilting when mounted on a container mouth and which is hardly deformed during molding. SOLUTION: The synthetic resin cap includes a top plate 2 and a cylinder 3 hanging 3 from a periphery thereof, while an annular internal seal to be fitted into the container mouth is formed to protrude on an internal top face of the top plate 2. A thread 10 to be threaded with an external thread of the container mouth is formed on an inner wall surface of the cylinder 3, wherein a peripheral formation angle of the thread 10 is 600 to 720 deg..
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