A semitrailer landing gear, particularly for supporting trailers, including a supporting element, which can be telescopically displaced in the height thereof and which has an outer sleeve and an inner sleeve, the outer sleeve having a fastening flange for placing on a vehicle. The aim of the invention is to develop semitrailer landing gears with a reduced weight as well as with favorable manufacturing costs. To this end, the invention provides that at least one lateral wall of the outer sleeve and/or of the inner sleeve is provided with an angled wall section extending in an axial direction.