To change the installation position of a part called a utility where an outlet, a tap water plug and a gas plug, etc., for the supply of electricity and the supply of tap water and a gas, etc., to apparatuses to be used in experiment are installed in an experiment table.

For the utility box, the tap water plug, the gas plug and the outlet, etc., are arranged inside a box, flexible wiring is connected to the tap water plug and the gas plug, a cord is connected to the outlet, it is installed at an appropriate position of the shelf plate of the experiment table or the like, and the installation position is made changeable. Also, the shelf plate is provided with a rail to slide the box. Thus, the utility part is placed at a position convenient for the experiment.