The stage device where the alignment at these installation features is easy is offered. The winch (22) the secondary based board (21) the frame which is arranged (25) placing on, the secondary mount stand (20a - 20d) it constitutes, the winch (22) with the secondary based board (21) makes move, the frame (25) the main based board (11) the main mount stand which it possesses (10) it locks. The main based board (11) the secondary based board (21) the alignment it does the secondary mount stand (20a - 20d) the adjustment mechanism which is provided (30) with. Because the main mount stand (10) with the secondary mount stand (20a - 20d), the main positioning component (16) with the secondary positioning component (241 and 242) is provided, in order to be able to reconstruct alignment state, it is possible to separate. Therefore after conveying, the occasion where it assembles, the alignment is easy.
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