To facilitate disassembly/assembly, to reduce the volume to facilitate transportation when disassembled, and to easily perform connection and to cope with the breadth of an installation place when assembled.

A first unit frame body 20 is constituted of a rectangular first frame body 201, connecting metal fittings 401 and 402 provided on the side faces at the almost vertical center part of the first frame body 201 and rolling wheels 90 provided on the lower surface. A second unit frame body 30 is constituted of a rectangular second frame body 301 and tightening metal fittings 501 and 502 provided in the extending direction of the upper and lower ends of the second frame body 301. A pair of first unit frame bodies 20 are made to face each other at a prescribed interval so that the connecting metal fittings 401 and 402 face each other, the second unit frame body 30 is arranged so as to be orthogonal to the almost center of the first unit frame body 20, the tightening metal fittings 501 and 502 are engaged with the connecting metal fittings 401 and 402, and the first unit frame bodies 20 and the second unit frame body 30 are tightened in an H shape.

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