To provide an arena in which a main frame and a stand frame are separated to prevent a load from being concentrated on a specific member, the sectional size of the member is not required to be increased, the cost of the member is reduced, and the indoor space is not narrowed while separating the main frame from the stand frame.SOLUTION: A main frame 4 is joined to a foundation 54 in the vicinity of a wall part W and has a pair of erected parts 42 erected in the vertical direction; a stand frame 31 is joined to a foundation 53 in the vicinity of the wall part W and provided with an erected part 313 erected obliquely upward toward a field part 2 side. The plurality of main frames 4 are disposed at regular intervals; the erected part 313 of the stand frame 31 is joined to the foundation 54 between a place where adjacent erected parts 42 are joined to the foundation 53; the erected part 42 and the erected part 313 are joined to the foundations 54, 53 in a row in the direction in which the main frame 4 is arranged.SELECTED DRAWING: Figure 2
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