Recently many otologists reported electric stimulation with hard wire or electronic cochlea through the scala tympani for profound sensory hearing loss or totally deaf and obtained sense of hearing clinically. The author attempted to examine the influences of the inner ear by electric stimulation through the electronic cochlea. Results of this examination were as follows : At the current level of 10mA, distorsion of the outer hair cells such as irregular arrangement, karyolysis and pyknosis of the nuclei of the first and second row was observed. However, spiral ganglion cells and cochlear nerve fibers showed no morphological changes. Under the current level of 0.2mA. No significant change of the hair cells such as karyolysis and pyknosis, basilar membrane, spiral ganglion and cochlear nerve fibers was observed.