To provide a printer exhibiting high reliability even when an acid, alkaline or oil ink is used, and to provide a degassing method of ink for printer.

The printer comprises a print head having an ink nozzle for ejecting ink, an ink tank 3, a passage 5 for transporting ink from the ink tank 3 to the print head 1, and a degassing unit 7 provided in the ink transportation passage 5 in order to move gas contained in the ink to the outer space wherein the degassing unit 7 comprises a porous support 9 and a ceramic separation film 11 formed on the surface of the porous support 9.