The present invention can easily be assembled, easy to carry and store, can be set up in a suitable area according to a performance environment, and is improved in use efficiency. A bottom plate fixed to the body and configured to form a bottom surface of the performance space, and legs coupled to the body and having a length, The body includes: a support frame having a shape of 'pipe' for fixing the bottom surface of the bottom plate to the upper surface thereof; and a connecting body having a plurality of fitting protrusions formed on a part thereof, And fixing means which is fixed to the connecting body and receives and fixes the upper portion of the legs; The connecting body may have a flat shape and may be connected and fixed in a direction orthogonal to the supporting frames. The fixing means includes a tubular body having a receiving hole in which the upper portion of the leg is received, a coupling piece extending from an outer peripheral surface of the tubular body and having a coupling hole screwed into the support frame, And a pressing member which presses the outer circumferential surface of the leg fitted to the ball.
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