Abstract: In a replacement cap for a vessel, in which a cap body 2 is mounted on a mouth portion 1a of a vessel 1 so as to be replaceable so that a liquid in the vessel 1 can be drunk through a tube 5 provided on the cap body 2, the cap body 2 is provided with an air supply port 4 having cup-shaped valve means 10 which is closed normally and is opened to supply the outside air into the vessel 1 when the interior of the vessel 1 becomes at a negative pressure. Since the valve means 10 is opened to supply the outside air into the vessel 1 when the interior of the vessel 1 becomes at a negative pressure, a liquid in the vessel 1 can be drunk smoothly through the tube 5.

Abstract: To provide the lid body of a beverage container, wherein a mouthpiece tube communicated to the beverage container is stored within a storing portion in the blocked condition by one-touch operation of an openable lid and taken out of the storing portion by one-touch operation, and the lid body of a beverage container with a cap, wherein a cap which can store the mouthpiece tube is connectably provided therein. The lid body of a beverage container is composed of a main body portion and an openable lid mounted on the main body portion. The main body portion comprises a bowl-like storing portion for storing a mouthpiece tube. On the other hand, the openable lid are projected a pair of connecting portions for connecting each of the switching mechanisms.