An ink supplying container is disclosed. In the ink supplying container, when the internal pressure of an ink container is made a positive pressure which is higher than atmospheric pressure so that nozzles of a recording head are cleaned and recovered by discharging a small amount of ink, a volume control unit restrains a flexible member of the ink container from expanding. When the internal pressure of the ink container is made a negative pressure optimal for printing which is lower than the atmospheric pressure so that a letter and/or an image is printed on a recording medium by the recording head, the volume control unit does not restrain the flexible member from expanding, and the volume of the ink container is maintained at almost the same volume as that at the time when the internal pressure of the ink container is made the positive pressure.