Abstract: A desk includes a top which has four legs extending from a bottom thereof. A frame is disposed to the bottom of the top and which has two tracks formed on two opposite sides thereof for a sliding plate to be slidably received therein which has an L-shaped plate disposed thereto. An auxiliary rack has one end thereof pivotally connected to the L-shaped plate and the other end of the auxiliary rack has wheels disposed thereto so as to roll on the ground. The auxiliary rack includes two horizontal first side rails and two vertical second side rails and a board disposed between the two first side rails. The auxiliary rack has a section where the board does not extend and two rods are connected between the two first side rails within the section so as to hang suspension files between the two rods. A rectangular support is pivotally disposed to the bottom of the top for a key board to be put thereon.