Abstract: The hearing aid according to the invention comprise: a skin penetrating abutment, a skin penetrating abutment, a rod with a coupling part, operative to allow releasable connection between the rod and the abutment, a hearing aid housing with an opening, where the rod extends through the opening and into the hearing aid housing, a vibrator connected to the rod in the hearing aid housing, and resiliently mounted between a distal housing wall part which faces away from the opening and a proximal housing wall part which comprises the opening, whereby the proximal wall part further comprise a relief portion which extends into the area between the vibrator and the coupling part of the rod and where, the distance between the relief portion and the coupling part of the rod is smaller than the distance between the vibrator and the inside of the distal wall part.