In a hearing aid provision can be made for a housing that is worn outside of an auditory canal of a user. Then, sound or electrical signals are conducted into the auditory canal from the housing. To this end, provision can be made for a conducting element such as a sound tube or a cable. The conducting element is then connected to the housing via a coupling element. This connection must be embodied such that the coupling element does not detach from the housing on its own accord. The user must be able to remove the coupling element and the conducting element from the housing in a simple fashion in order e.g. to be able to clean the former two parts. Accordingly, a coupling element and a housing can be interconnected in a detachable fashion, with this connection containing a dovetail joint for the hearing aid.