A dismantable writing desk storable in a case is described. The desk comprises a foldable base; a cover in the form of a housing coupled on the base and serving as a case to store the desk; a leg attached to the cover lower part; a left and right walls coupled to the cover and formed by a lower half and an upper half coupled to each other; and, a foldable board mounted to the left and right walls. To store the desk, the foldable board is detached and folded; the walls are detached and their halves are decoupled; the cover is detached from the base and the leg detaches from the cover, storing therein the base, the leg and both walls halves. In an embodiment, the desk is provided with transparent vertical panels mounted on the cover.