The invention relates to a backing piece (10) for attaching an electrical component to a housing wall (20) of an electrical household appliance, wherein said backing piece (10) is arranged behind a matching opening (30) in the housing wall (20) and is supported with an elastic sealing lip (12), which extends peripherally around the opening (30), against the rear side of the housing wall. The backing piece (10) is designed with a plurality of holding elements (14a-14h) which project from the body (11) and form a gap (x, y) between themselves and the sealing lip (12), wherein said gap is designed to receive a section of the housing wall (20) at the edge (31-34) of the opening (30). Said holding elements (14a-14h) are distributed such that a sufficiently high pressing pressure is introduced into each section of the sealing lip (12). The invention further relates to an electrical household appliance and to a method for installing the backing piece.