There is provided a liquid container including a casing that has a side wall surrounding a container portion configured to contain a liquid; a projecting portion that is provided inside of the container portion to be protruded from a fourth wall corresponding to a bottom of the container portion; and a supply port that is provided in the casing to communicate with outside of the casing through an outer area outside of an overlapping area which overlaps the projecting portion in the container portion in a planar view of the fourth wall and discharge the liquid from the container portion. At least part of a second wall provided to face the projecting portion across a first liquid reservoir has optical transparency.