Liquid tank

A liquid tank that is mounted on a carriage provided with a liquid ejection head movable in a Y direction, and configured to contain liquid to be supplied to the liquid ejection head, the liquid tank comprising:

• a liquid chamber configured to contain the liquid;
• a liquid inlet port through which the liquid can be injected into the liquid chamber;
• an atmospheric air introduction portion for introducing atmospheric air into the liquid chamber;
• a liquid outlet provided in a bottom face of the liquid chamber;
• and
• a division wall arranged in the liquid chamber,
• wherein the division wall has first division walls perpendicular to the Y direction in a mounted state in which the liquid tank is mounted on the carriage, and
• the liquid chamber includes:
• a plurality of small liquid chambers partitioned by the first division walls,
• an upper communication portion that allows the plurality of small liquid chambers to be in communication with each other in the mounted state, and
• a lower communication portion that is positioned below the upper communication portion in the mounted state, and allows the plurality of small liquid chambers to be in communication with each other.