To provide an application tool solving the problems of a blur in application and defects in discharge of ink due to decrease in an amount of ink contained inside a vessel and outflow of the ink by suppressing isolation between molecules of a vessel material by a stress caused by press-fitting of the connection member to control a crack of the vessel and ensuring a slipping-off strength of a connection member from a container.

An application tool for press-fitting the connection member in a container containing a liquid includes the connection member made of a molded product of a synthetic resin material having a glass transition temperature lower than the glass transition temperature of the container.