There is provided a tank including a liquid inlet port, an atmosphere open port, a liquid outflow port, a first liquid chamber having a first atmosphere communication channel, a second liquid chamber being in communication with the first liquid chamber and having a second atmosphere communication channel, and a liquid channel. The liquid inside the liquid channel is movable along with a liquid consumption of a liquid consuming device connected to the tank. With the tank in a usage posture, when the liquid is stored in the first liquid chamber and the second liquid chamber, the liquid level of the liquid stored in the first liquid chamber is formed independently from the liquid level of the liquid stored in the second liquid chamber.