A supporting apparatus for supporting a display includes: a pillar body; a limiting unit connected to the pillar body to define a limiting space; a sliding unit movable on the pillar body; a mounting unit connected fixedly to the sliding unit and including a mounting seat for mounting the display; and a torsion coil spring that has a straight portion secured fixedly to the sliding unit and a coiled portion received in the limiting space. The torsion coil spring is retractable and extendable to convert between a retracted state, where the sliding unit is adjacent to the limiting space, and an extended state. When the torsion coil spring is converted from the retracted state to the extended state, the sliding unit is moved away from the limiting space.