Abstract: A closing structure includes: a fluid reservoir for storing a fluid; a tube member having a mouth end surface at a tip in an axial direction of the tube member, the tube member having an inside communicating with the fluid reservoir; a gasket configured to be disposed on the mouth end surface of the tube member; an end cap configured to: (i) be attached to the tube member; and (ii) close the tube member at the mouth end surface of the tube member through the gasket; and a clamping piece fixed to the end cap, the clamping piece being configured to clamp the gasket between the clamping piece and the end cap.

Abstract: A closing structure includes: a fluid reservoir in which a fluid is to be stored; a tube member extending in a tubular shape, the tube member having a mouth end surface formed at a tip in an axial direction, the tube member having an inside communicating with the fluid reservoir; a gasket disposed on the mouth end surface; an end cap attached to the tube member, the end cap being configured to close the tube member at the mouth end surface through the gasket; and a clamping piece fixed to the end cap, the clamping piece being configured to clamp the gasket between the clamping piece and the end cap.