on the substrate surface side 8 of the cross section of the ink discharge port but is produced on the ink flow path side of the level difference portion 10 which is separate therefrom for comparison fig3 shows a cross sectional view of the essential portions of a liquid discharging head manufactured by a conventional method of manufacturing a liquid discharging head in the case of the conventional liquid discharging head a minute projection 9 is produced on the substrate surface side 8 of the cross section of the ink discharge port in the present invention as described above the minute projection is produced at a location separate from the substrate surface side of the cross section of the ink discharge port and therefore the deviation of the flying direction of an ink droplet due to the asymmetry of the inner shape of the ink flow path is minimized also a reduction in a refill frequency due to the hindrance of the flow during ink refilling can be minimized further three dimensional flow path structure is formed by the nozzle constituting resin layers and therefore the height of the ink flow path important to the refilling characteristic of the ink i e the height of the photodecomposable resin layer can be formed with good accuracy consequently there can be provided an ink jet recording head which is capable of effecting ink discharge free of dot misalignment irregularity diminished dot printing etc at a high quality and stably the present invention will hereinafter be described in greater detail with respect to some embodiments thereof 1 first as shown in fig1 a as a positive type resist which is.