To solve such a problem in the use of personal computers as difficulty in using the personal computers unless the space can be secured because such a space as to accommodate desks installed in the rooms, often can not be secured.

A case provided with an openable lid is constituted of three of a desk for personal computers, a housing drawer and a desk free to draw out. The case is turned to a shape of a desk regardless of locations to allow the use of the personal computer or other operations even in the locations where no desk is prepared or the utilization thereof as a chair.