To provide a container of which a cap can be easily fixed to and removed from a container body, a liquid matter housed inside the container body does not carelessly leak out, and the inside of the container body can be surely sealed up to the outside of the container body.

A space provided between an outer peripheral face of an opening in the container body and an inner peripheral face of a tube part in the container body can be invaded by a liquid matter housed inside the container when the tube part is fitted in the outer periphery of the opening in the container body. Between the outer peripheral face of the opening in the container body and the inner peripheral face of a free end of the tube part, a sealing means is provided, so that the outer peripheral face of the opening in the container body and the inner peripheral face of the free end of the tube part are closely fitted to block the space from communicating with the outside of the vessel body when the tube part is fitted in the outer periphery of the opening in the container body.