A liquid storing device includes a storage unit that stores a liquid to be consumed and a rotation member inside the storage unit that rotates around a rotation axis. A blade member is installed to the rotation member to be movable in the axis direction of the rotation axis with respect to the rotation member and has a specific gravity smaller than that of the liquid. A detection member detects the blade member when the blade member is located vertically at a detection position. When the rotation member rotates in one direction, the blade member agitates the liquid while moving toward the lower side of a liquid surface of the liquid in the vertical direction along the axis direction in accordance with rotation of the rotation member. When the rotation member stops rotating, the blade member floats toward the liquid surface due to buoyancy of the liquid.