| 摘要 |
PROBLEM TO BE SOLVED: To provide a cap body by which an inside plug attached to a container mouth cylinder part can be easily opened and which exhibits excellent sealability.SOLUTION: A cap main body part (10) and an inside plug part (30) are screwed. A sealing plate (31) for sealing a container mouth cylinder part (2) is divided into an inside sealing plate (31a) and an outside sealing plate (31b) by concentric first circumferential weakened part (31c) and second circumferential weakened part (31d). In addition, the outside sealing plate (31b) is divided into a plurality of pieces by a plurality of radial weakened parts (31e). A hollow curved surface body (19) is obtained by forming so that a height of a side wall increases from an outer side to an inner side with respect to a radius direction or forming so that the height of the side wall increases from a rear end to a tip end with respect to a circumferential direction to a base body, wherein the base body is a structure in which both ends of a part of the side wall of a double cylindrical wall structure which is concentric to the first and second circumferential weakened parts (31c, 31d) are connected with a curved surface. |
