To realize an easy and quick shift of position of OA machines by setting a display of computers and the like below the table top of a desk that has a transparent window as it can be moved by a wagon.

A wagon that can at least mount a CRT display D is arranged below the top board 3 that is close to the user at the counter and has a transparent window on its center, while it can move. The rack of display holder 14 that is supported by side boards 11 from right and left above the bottom board 10 of the wagon and of which section is semi V-shaped has two supporting boards right and left of which shapes are right angled-triangle each other. On the side boards 11, long holes that are held by pins for adjusting an user's figure and bent pin holes are mounted in order to adjust the height and the inclination of the rack at the wagon. Wagon 9 can be freely fixed or moved as casters 15 that is set beneath the four corners of it and a stopper that stops the casters from moving are mounted, so stable and good working condition will be realized.