Cap and beverage containing closing means

A container internal pressure at the time of re-plug can be prevented from increasing excessively, and the user without uncomfortable feeling, yet provides a cap which can prevent deformation of the cylindrical portion. A cap 1 is provided with a cap body 4 having a top plate portion 2 and the cylindrical portion 3 depending from its periphery, the cylindrical portion 3, a knurl portion 15, and the non-knurl portion 18 is arranged in the circumferential direction in are formed. The knurl recess 12, is formed knurl portion vent hole 16, the non-knurl portion 18, the circumferential direction is longer than knurl portion vent hole 16 long non-knurl portion vent hole 17 is formed. .FIELD 1