A liquid cartridge includes: a cartridge casing; and a liquid supply portion. The cartridge casing has a liquid storage chamber configured to store a liquid therein. The cartridge casing has an inner surface defining the liquid storage chamber. The liquid supply portion has a liquid supply hole extending in a frontward direction from the liquid storage chamber to an outside in an operational posture of the liquid cartridge. The frontward direction is perpendicular to a gravitational direction. The inner surface includes a side surface and a bottom surface in the operational posture of the liquid cartridge. The bottom surface has a curved region connected to the side surface.