Holding device for releasable fastening onto a building roof , in particular in a region of a verge of the building roof , which comprises the following: - at least one tensioning element , which is of elongated shape and comprises a first longitudinal extension direction; - a first tensioning arm comprising a tensioning element support , wherein the tensioning element support supports the tensioning element ; - a second tensioning arm ; and - a connecting device having a second longitudinal extension direction connecting the first tensioning arm to the second tensioning arm , wherein at least one of the first tensioning arm and the second tensioning arm is a movable tensioning arm which is movable relatively to the connecting device in such a way that a distance between the first tensioning arm and the second tensioning arm , into which a part of the building roof is clampable, is variable, wherein, when the holding device is mounted onto the building roof , the first longitudinal extension direction of the at least one tensioning element is aligned at least substantially orthogonally to the second longitudinal extension direction of the connecting device; and wherein a tensioning arm holder of the at least one movable tensioning arm is connected to a threaded element , which is constructed in several parts, and wherein the connecting device comprises a connecting strut which is hollow at least in some areas and in which a threaded spindle is arranged at least in some areas characterized in that the threaded element comprises an elongated guide part and a nut which is removably inserted into the elongated guide part and is engaged with the threaded spindle in such a way that the at least one movable tensioning arm moves in translation relatively to the connecting device when the threaded spindle is rotated. - at least one tensioning element , which is of elongated shape and comprises a first longitudinal extension direction; - a first tensioning arm comprising a tensioning element support , wherein the tensioning element support supports the tensioning element ; - a second tensioning arm ; and - a connecting device having a second longitudinal extension direction connecting the first tensioning arm to the second tensioning arm , wherein at least one of the first tensioning arm and the second tensioning arm is a movable tensioning arm which is movable relatively to the connecting device in such a way that a distance between the first tensioning arm and the second tensioning arm , into which a part of the building roof is clampable, is variable, wherein, when the holding device is mounted onto the building roof , the first longitudinal extension direction of the at least one tensioning element is aligned at least substantially orthogonally to the second longitudinal extension direction of the connecting device; and wherein a tensioning arm holder of the at least one movable tensioning arm is connected to a threaded element , which is constructed in several parts, and wherein the connecting device comprises a connecting strut which is hollow at least in some areas and in which a threaded spindle is arranged at least in some areas characterized in that the threaded element comprises an elongated guide part and a nut which is removably inserted into the elongated guide part and is engaged with the threaded spindle in such a way that the at least one movable tensioning arm moves in translation relatively to the connecting device when the threaded spindle is rotated. <EOS>