CAP, CLOSING DEVICE, AND BEVERAGE-FILLED CLOSING DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a cap capable of preventing a content fluid from gushing to the outside from an exhaust hole of a knurled part.SOLUTION: A cap 1 includes a top plate part 2 and a cylindrical part 3 suspended from a peripheral edge of the top plate part 2. A knurled part comprising one or more knurled recesses 14 is formed in the cylindrical part 3. A knurled part exhaust hole 15 is formed in at least one of the knurled recesses 14. An upper edge 15a of the knurled part exhaust hole 15 is positioned to an inner side in comparison with a lower edge 15b, and an opening direction of the knurled part exhaust hole 15 is a direction including an upper component.