Liquid ejection device including tank and cartridge connectable thereto

A liquid ejection device comprising:

• a cartridge comprising:
• a first storage chamber configured to store therein a liquid;
• a first air communication port allowing the first storage chamber to communicate with an atmosphere;
• and
• a supply portion configured to supply the liquid stored in the first storage chamber;
• a cartridge receiving portion comprising:
• a joint to which the supply portion is connectable;
• a second storage chamber configured to store therein the liquid supplied, by water head difference, from the first storage chamber through the supply portion connected to the joint;
• an outlet port positioned below the joint, the liquid stored in the second storage chamber is configured to be discharged through the outlet port;
• and
• a second air communication port allowing the second storage chamber to communicate with the atmosphere;
• and
• a head configured to eject the liquid flowing thereinto from the second storage chamber through the outlet port,
• wherein the second storage chamber has an upper region and a lower region positioned below the upper region defined in an operational posture of the liquid ejection device, the joint being connected to the upper region;
• and
• wherein the lower region has a portion positioned below a lowermost surface of the cartridge in a vertical direction and extending along the lowermost surface of the cartridge in a state where the supply portion of the cartridge is connected to the joint in the operational posture of the liquid ejection device, the portion of the lower region extending away from the upper region in a protruding direction crossing the vertical direction farther than the upper region.