Abstract: A desk apparatus is provided with a pair of leg members, each having two main leg member parts that are installed on a floor surface and extend in a vertical direction and that are connected to each other by means of a crosspiece portion at upper portions of the main leg member parts, and a pair of inner connecting rods and a pair of outer connecting rods that extend along a width direction and connect the upper portions of the pair of leg members. The inner connecting rods are connected together by bridge members so as to constitute connecting units. The connecting units are attachable to and detachable from a top plate support, and a first top plate unit is attachable to and detachable from the top plate support.