(57) The hearing device (1) comprises an insertable part (16), which is to be inserted
into an ear canal of a user of the hearing device (1). The insertable part (16) may
be identical with the hearing device (1) itself, and the insertable part (16) comprises
a casing, which casing comprises a deformable part (2). The hearing device (1) comprises
means for changing a cross-sectional area (20) of the deformable part (2), which change
in the cross-sectional area (20) is reversible. The means for changing a cross-sectional
area (20) of the deformable part (2) may comprise at least one deformable volume (5)
containing a fixed amount of a filler (4). The means can be a means for changing the
cross-sectional area (20) of the deformable part (2) through changing the axial extension
of the deformable part (2). The means can be a volume capacity change means for changing
the cross-sectional area (20) of the deformable part (2) through changing the capacity
of a variable volume arranged within the hearing device (1), the deformable part (2)
being arranged on the outside of the variable volume.
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