Abstract: To provide an ink-jet recording device in which ink sucked in maintenance is utilized again and an ink absorber for waste ink is not required, process black ink obtained by mixing ink in each color of cyan, magenta and yellow is used for black ink. In a maintenance part, a cap is attached to each recording head, and dust, bubbles and others in the recording head are removed together with ink by sucking by a pump. Process black ink is processed by mixing ink sucked at this time. Dust and bubbles in the ink are removed by a filter and after the concentration of the ink is adjusted by a diluent adder, the ink is supplied to a recording head for black ink through a black ink filling path and utilized there again. In this process, no waste ink is produced and an ink absorber for waste ink is not required.