To provide an article mounting top plate whose movable top plate is not easily scratched and is pulled out to a mounting area corresponding to various applications.

A desktop type personal computer A or a notebook type personal computer B is supported by a support top plate 4 comprising an article mounting top plate 3 and support parts 7 projected or exposed on the upper surface of the movable top plate 5, etc., and the movable top plate 5 is horizontally moved to a diagonally forward right advanced position projected to the outer side of the front end side of the support top plate 4 or a receiving plate 6 and is pulled out to the mounting area corresponding to the various applications of mounting or operating a mouse Ad or performing desired work or the like. When it is not needed, the movable top plate 5 is horizontally moved to a diagonally backward left retreat position to be stored on the inner side of the front end side of the support top plate 4 or the receiving plate 6 and is stored on the inner side of the front end side edge part of the support top plate 4 or the receiving plate 6.