Fastening method and fastening device for B-pillar trim panel of motor vehicle with curtain airbag

The invention relates to a fastening device (10) for a B-pillar trim panel of a motor vehicle with a curtain airbag. The fastening device includes a shell-shaped pillar trim panel element (22) and an inner pillar element (12). According to the invention, the shell-shaped pillar trim panel element (22) is provided with a horizontally extending guide groove (30) for receiving an edge element of the roof lining (42), and a first form-fitting element (34) fastened to an inner side (28) of the shell-shaped pillar trim panel element (22) is provided in the upper region (24). A second form-fitting element (16) is arranged in an upper region (14) of the inner column element (12). A lower partial region (18) of the second form-fitting element (16) allows the first form-fitting element (34) to partially penetrate to the outside. The second form-fitting element (16) is arranged to prevent a movement of the first form-fitting element (34) inward and in a direction parallel to a straight forward travel direction (44) of t