To shade the rear of a desk and furniture easily without exchanging a blind panel in the rear of the desk or changing right and left panel fixing positions even when a work area is expanded with the installation of the furniture at the side of the desk.

The desk 1 is provided with the panel 13 vertically facing at the rear of the top board 4. The width of the panel 13 is wider than that of the top board 4. The panel 13 is slidably supported from side to side by a bracket 14 provided on the desk 1 and rods 22 provided on the panel 13.