To prevent a shelf from being drawn out excessively when the shelf is drawn.

A guide member 7 is attached on the receiving side of a shelf 3 for supporting either side edge 4 of the shelf slidably, and a protruding stopper member 6 is attached around the front end of each side edge 4. An engaging protrusion 7g, which engages with the stopper member 6, is formed near the rear end of the guide member 7. When both side edges 4 are supported and guided by the guide members 7, the shelf 3 is drawn out, the stopper member 6 is engaged with the engaging protrusion 7g, drawing of the shelf 3 is tentatively stopped and then when the rear end of the shelf 3 is brought up and further drawn, the stopper member 6 rides over the engaging protrusion 7g and the engagement of them is released, and both side edges of the shelf are completely drawn out from the guide members 7.