Abstract: A double top-plate desk comprises a lower or first top plate 10, leg parts 40 for supporting the first top plate 10, and an upper or second top plate 20 which is substantially the same in size and shape as the first top plate 10, disposed above and substantially in parallel with the first top plate 10, slidably toward the rear (R) of the desk. The top plate 20 is slidable relative to the first top plate 10, from a state in which the two top plates are laid to overlap one above the other, toward the rear of the desk. To this end, a slide mechanism 30 is provided between the upper surface of the first top plate 10 and the lower surface of the second top plate 20 while supporting the second top plate 20 slidably toward the rear of the desk above the first top plate 10.