An ink container includes an ink pack and a housing. The ink pack includes an ink containing section made from a flexible film and containing an ink therein, an ink supply port in communication with the ink containing section, and an engaging counterpart portion. The housing houses the ink pack. The housing includes a fitting portion that fits to the ink supply port of the ink pack and an engaging portion that engages with the engaging counterpart portion of the ink pack, and holds the ink pack in an ink filled state at a predetermined position in the housing through the fitting portion and the engaging portion. The engaging counterpart portion is slidable relative to the engaging portion according to lengthening of the ink pack accompanying consumption of the ink.