A cochlear implant. An audio processor converts sound into an electrical signal. An outer coil unit transmits the electrical signal into the head of a user. An inner coil unit transmits and receives the electrical signal transmitted by the outer coil unit. A main body is connected to the inner coil unit to convert the electrical signal into an electrical stimulation signal. An electrode unit is connected to the main body and inserted into a cochlea to stimulate auditory nerves of the cochlea using the electrical stimulation signal. The outer coil unit is configured to surround an ear. The outer coil has a modified structure by which wearing sensation and implantation convenience are improved.
