Provided is a method of manufacturing the standard ear shell for use in the ITE type general-purpose hearing aid considering the shape and size of the external auditory meatus according to the embodiment of the present invention, that quantitatively measures shape and size of an external auditory meatus to calculate an average of the measured shape and size of the external auditory meatus, and minimizes an acoustic feedback of the hearing aid or a receiver to save a manufacturing cost, to thereby quickly provide the hearing aid for a patient, mass-produce an average model ear shell, and simultaneously maintain quality of the ear shell consistently.