Provided is a liquid tank in which air bubbles are less likely to remain in a valve mechanism provided in an on-carriage-type liquid tank. The liquid tank has a liquid supply portion, a first liquid chamber, a second liquid chamber that can contain the liquid to be supplied to the first liquid chamber, and a valve mechanism that is arranged between the first liquid chamber and the second liquid chamber, and the valve mechanism has, inside an exterior wall constituting the valve mechanism, a channel member, a biasing member, a valve body, and a rod from an upstream side of flow of the liquid in the stated order, the channel member is provided inside the biasing member, and includes a first channel in which the liquid can pass, and the exterior wall and the biasing member form a second channel through which the liquid can pass therebetween.