A cartridge mountable on a liquid ejection device , wherein the liquid ejection device includes a mounting section to which the cartridge and a different cartridge including an airbag are replaceably mounted, the cartridge and the different cartridge being capable of supplying liquid to a liquid ejection head that ejects the liquid, an air supplying portion including an air supplying passage , the air supplying portion being configured to supply air to the airbag of the different cartridge mounted on the mounting section , and a detection section configured to detect an error when a predetermined air pressure is not reached even if air is supplied from the air supplying portion , the cartridge comprises: a case that stores the liquid or allows the externally supplied liquid to pass through, the case including a communication portion that communicates with the air supplying passage in a mounted state in which the cartridge is mounted on the liquid ejection device ; and a first leakage limiting portion that limits leakage of air supplied from the air supplying portion into an atmosphere by cooperating with the air supplying portion in the mounted state, and the communication portion includes a second leakage limiting portion that limits leakage of the air supplied from the air supplying portion into the case through the communication portion . the liquid ejection device includes a mounting section to which the cartridge and a different cartridge including an airbag are replaceably mounted, the cartridge and the different cartridge being capable of supplying liquid to a liquid ejection head that ejects the liquid, an air supplying portion including an air supplying passage , the air supplying portion being configured to supply air to the airbag of the different cartridge mounted on the mounting section , and a detection section configured to detect an error when a predetermined air pressure is not reached even if air is supplied from the air supplying portion , a mounting section to which the cartridge and a different cartridge including an airbag are replaceably mounted, the cartridge and the different cartridge being capable of supplying liquid to a liquid ejection head that ejects the liquid, an air supplying portion including an air supplying passage , the air supplying portion being configured to supply air to the airbag of the different cartridge mounted on the mounting section , and a detection section configured to detect an error when a predetermined air pressure is not reached even if air is supplied from the air supplying portion , the cartridge comprises: a case that stores the liquid or allows the externally supplied liquid to pass through, the case including a communication portion that communicates with the air supplying passage in a mounted state in which the cartridge is mounted on the liquid ejection device ; and a first leakage limiting portion that limits leakage of air supplied from the air supplying portion into an atmosphere by cooperating with the air supplying portion in the mounted state, and a case that stores the liquid or allows the externally supplied liquid to pass through, the case including a communication portion that communicates with the air supplying passage in a mounted state in which the cartridge is mounted on the liquid ejection device ; and a first leakage limiting portion that limits leakage of air supplied from the air supplying portion into an atmosphere by cooperating with the air supplying portion in the mounted state, and the communication portion includes a second leakage limiting portion that limits leakage of the air supplied from the air supplying portion into the case through the communication portion . <EOS>