Abstract: Hearing apparatuses should be manufactured as simply as possible and with the closest possible fit. Accordingly, a molding structure is provided, which represents a model for the direct shaping of an otoplastic of a hearing apparatus. The molding structure has a sealing element, which can be positioned in the auditory canal. A molding mass is inserted into the auditory canal to a side of the sealing element facing the outlet of the auditory canal. The molding mass and the sealing element here are connected to form the model of the hearing apparatus and the sealing element has the exact shape of a part of the hearing apparatus.