Container cap structure and container using the same

Problem to be solved: To provide a highly versatile cap structure for a container capable of discharging gas generated in the container to the outside while having a simple structure, and capable of reliably preventing leakage of contents. [Solution] the cap includes a cap body having a top wall and a peripheral wall suspended from the top wall and formed to be able to be fitted to a neck of a container body, a top wall installed in the cap body and sealing a neck opening of the container body, an inner plug having a seal cylinder suspended from the top wall and formed to be insertable into the neck of the container body, And a sheet-like packing interposed between the top wall of the cap body and the top wall of the inner plug, wherein an opening is formed in the top wall of the inner plug. Selected drawing:...