An ink cartridge includes a case having a bottom wall and side walls forming an ink chamber, with a top surface of the case being open, an air introduction opening formed in the bottom wall of the case that introduces air into the ink chamber, and a hollow member that is in direct communication with the air introduction opening, wherein the hollow member is formed integrally with and extends from the bottom wall of the case towards the top surface in a first direction, and an upper end of the hollow member is open.