Patent ID: 8336724

Claim:
A beverage container, comprising: a container main body having a container opening part for pouring a liquid beverage therein; a base member which covers the container opening part and in which a drinking spout is disposed; and a cap body configured to openably/closably cover an upper part of the base member, wherein the base member has: a first ventilation structure configured to regulate a pressure variation in the container main body and a second ventilation structure configured to introduce air from outside when pressure within the container main body enters a negative pressure state in relation to outside pressure, and configured to prevent the liquid beverage contained in the container main body from leaking, the first ventilation structure and the second ventilation structure together forming a unit separate from the drinking spout and providing a separate path for introducing air and regulating pressure variation in the container main body; wherein the cap body has formed thereon a ventilation open/close structure configured to change a state of the first ventilation structure to at least one of a ventilation state and a closed state, the ventilation open/close structure is configured to sealably close the first ventilation structure when the cap body is in a portable state in which the cap body is disposed to cover the drinking spout so that a user can carry the beverage container and when the cap body is in a drinking state in which the cap body is disposed to expose the drinking spout so that the user can use the drinking spout, and the ventilation open/close structure is configured to bring the first ventilation structure into the ventilation state when the cap body is in an operating state in which the cap body is disposed in an intermediate position between the portable state and the drinking state.