The invention relates to a mounting device (16) for mounting a support element (14), in particular a profile rail, an accessory device, in particular a
solar module or solar collector, on a mounting surface (12) of a building, in particular on a roof covering element, preferably on a
roof tile, or on a wall or roof section, preferably on a wall or roof mounting base, comprising a base element (18) and a
coupling element (20) connectable to the base element (18), wherein the base element (18) can be attached to or fastened to the mounting surface (12) and the support element (14) can be coupled or connected to the
coupling element (20), so that in a mounted state of the mounting device (16) the support element (14) can be fixed in a selected orientation direction, in particular in a transverse or longitudinal orientation, on the mounting surface (12). The
assembly device (16) comprises a connecting element (22) with a base side (27) facing the base element (18) and a
coupling side (32) facing the coupling element (20), wherein the coupling element (20) and the base side (27) can be attached or fastened to the base element (18) on the coupling side (32) in at least one defined or definable respective connection position, such that the base element (18) can be indirectly connected or connected to the coupling element (20) by means of the connecting element (22), wherein at least one of the respective connection positions can be changed in such a way that at least two different orientation directions of the support element (14), in particular offset by 90° to each other, can be selectively realized.