Abstract: An in-the-ear hearing aid is formed by an ogival body (1) which is meant to be removably inserted into the acoustic meatus of the external ear, and inside the ogival body (1) there being accommodated a microphone (2) communicating (3) with the external environment; an amplifier (4) being connected to the microphone (2); an electro-acoustic transducer (5), also called a receiver, connected to the output of the amplifier (4) and communicating with the duct (401, 501) having one opening at the internal end of the ogival body (1); and a housing for one or more piles or batteries for the hearing aid electric power.