Abstract: A holding device (1) for the accommodation, for example the clamping accommodation, of a telephone unit (18), in particular a handset of a car telephone or of a mobile telephone, has two side walls (2, 3) that are arranged at a distance from each other for positioning the telephone unit (18), the distance between the side walls (2, 3) being smaller than the width of the telephone unit (18), in order to accommodate the telephone unit (18) between them in a first position in which main faces of the telephone unit (18) are situated opposite the side walls (2, 3), and in order to store the telephone unit (18) in a second position, on longitudinal edges of the side walls (2, 3), in which the main faces of the telephone unit (18) are situated transversely with respect to the side walls (2, 3). The distance between the side walls (2, 3) advantageously corresponds at least approximately to the thickness of the telephone unit (18).