To enable a screen panel to be moved by moving a wagon main body to make a change of a working area easier, by attaching an upward protruding screen panel on the back across almost the whole width of the wagon main body to store documents, business appliances, etc.

A screen panel 4 is equipped on the back face across the whole width of this wagon 1 with casters 2 and a shutter door 3. The screen panel 4 is supported by fitting a pair of slide rails 6 mounted on the back face of the screen panel 4 into a pair of right and left rail supporter 5 attached on the back plate 11 of the wagon 1. Plural dents 8 are formed on the back face of a slide rail, and correspondingly a stopper pin is housed in a holding hole 5a formed in the rail supporter 5. Thereby the height of the screen panel 4 can easily be changed by strongly moving the screen panel 4 in the vertical direction to release the connection.