To make it possible to fold compactly when it is not in use even though, without extra space for storage.

For this desk, the bottom face of top plate 2 is fixed with an axis on the top part of a support 3 that is placed keeping standing on right and left leg 5, then the back end of the bottom face of the top plate 2 is hinged on the upper end of front part of the wiring box 9 with a hinge 10. The lower part of the wiring box 9 is connected to the support 3 with a level 20 that forms a parallel link cooperated with the back part of the top plate 2, and a lock mechanism which keeps the state as it is when the top plate 2 is moved to a horizontal position is set. Then, when the top plate 2 is rotated from the horizontal position to the vertical position, the wiring box 9 is approached to the support 3 and placed under the bottom part of the top plate 2 like folding.