Patent ID: 8496129

Claim:
A cap comprising: an inside plug, which, together with a container main body, forms an airtight space for enclosing contents, and which has a separating part for forming an aperture part in the airtight space; and an upper closure having a screwing part that enables attachment and detachment to and from the container main body by a rotation operation, and an opening portion that forms the aperture part by separating the separating part from the inside plug due to the rotation operation of the screwing part; the separating part is an intended aperture part to be severed from the inside plug; the opening portion includes a second threaded member, which relatively displaces the intended aperture part relative to an external portion extending outwardly from the intended aperture part by screwing together with a first threaded member disposed in the intended aperture part; the opening portion includes a cutting member, which moves together with the screwing part, and which causes the external portion to relatively separate from the intended aperture part; and the second threaded member is a male thread, and is formed on an inner side of the first threaded member, which is a female thread, and the cutting member is formed outer side of the first threaded member.