PURPOSE: To make it possible to produce a continuous and wider sport area than a single court in sport facilities or the like and use the space for other services than squash athletics and make the best use of the limited space as a result.

CONSTITUTION: A rectangular athletic floor 11 is provided with a front wall 12, a back wall 13 and side walls 14 and 15 on both sides, which may be erected on the floor in every direction. It is so arranged that one side wall 15 selected from the left and right sidewalls 14 and 15 be movableto the other sidewall 14 while the back wall 13 is designed to be turnable to the other side wall 14 with the end of the other side wall 14 as a fulcrum.