Abstract: An apparatus for raising and lowering devices such as an antenna including a multiple-stage cylinder system composed of a plurality of telescopically connected cylinder units each of which comprising an internal cylinder and an external cylinder that are connected at their lower ends so that the internal cylinders of the plurality of cylinder units form a sealed space so as to be filled with pressure oil used for extending and contracting the cylinder system. In addition, a fixture structure is provided on the lowest stage cylinder unit so that the cylinder system is held upright by the fixture structure at two points on the lowest stage cylinder unit in a vertical direction.