An ink-jet recording apparatus includes a recording head mounted on a carriage for ejecting ink onto a recording medium, the carriage being moved in a main scanning direction with respect to the recording medium to be transported in a sub-scanning direction, sub tanks mounted on the carriage for supplying the ink to the recording head, a main tank installed outside of the carriage for supplying the ink to the sub tanks via a tube, flat and thin ink bags corresponding to one ink color contained in the main tank, a connecting member for connecting the ink bags to the tube, and a common channel for allowing the ink bags to communicate with each other.