In a liquid ejection apparatus, a second casing is connected to a first casing so as to be rotatable relative to the first casing about a prescribed axis. The second casing holds a liquid ejection head and a cartridge holding portion. A lower wall of the cartridge holding portion extends in an insertion direction, along which the cartridge holding portion enables a liquid cartridge to move when the liquid cartridge is inserted into the cartridge holding portion, the insertion direction being directed from a central point in an insertion opening in a direction perpendicular to an ejection surface toward a point that is on a reference imaginary plane, on which the axis extends and which is perpendicular to the ejection surface, and that is closer to the axis than upper and lower reference points.