A printer having a head body (3) for feeding ink from an ink feed part (50) into a plurality of pressure chambers through an ink feed passage and pressurizing each pressure chamber to thereby discharge the ink in the pressure chamber through a nozzle, wherein the head body (3) is formed on the substrate and the substrate is locally removed from the head body (3), whereby the substrate is formed with an ink common passage for communicatingly connecting the ink feed passage and an ink feed port (51) in the ink feed part (50), while the head body (3) and the ink feed part (50) are joined by a joint (8) in the form of a projection left on the substrate, whereby the ink jet head is improved in the degree of integration, reduced in size and increased in rigidity.