A method for precisely manufacturing a liquid supply orifice of an ink-jet
recording head, even if a masking material includes pinholes which may
affect the forming of the ink supply orifice, is provided. The substrate
face provided with a mask used for forming the ink supply orifice has an
area covered with the mask for anisotropic etching, the area consisting
of a part provided with OSF layers and a part not provided with the OSF
layers which are determined by considering the amount of a side etching.