An ink cartridge includes a movable member which includes a signal blocking portion disposed within an inner space of a translucent portion, and a float portion disposed within an ink chamber. The float portion is configured to move between a first position and a second position based at least on an amount of ink disposed within the ink chamber. Specifically, as the ink within the ink chamber is dispensed from the interior of the ink chamber to the exterior of the ink chamber a surface of the ink within the ink chamber moves in a first predetermined direction. Moreover, when the float portion moves from the first position to the second position each of the float portion and the signal blocking portion moves in a second predetermined direction which is slanted with respect to the first predetermined direction.