PROBLEM TO BE SOLVED: To provide a breeding device, a breeding cage replacing/exchanging device, a breeding cage and a temporary breeding cage, capable of moving a small animal from a breeding cage for easily breeding the small animal and transferring the moved small animal to a different breeding cage, without touching the small animal.;SOLUTION: A breeding device includes: a plurality of floor rollers forming a floor surface with a small animal placed thereon by providing the plurality of rollers in parallel and horizontally inside a breeding cage or a temporary breeding cage, and slidable vertically independently, and respectively inside the breeding cage or the temporary breeding cage, removable to the opening of the breeding cage and removable to the opening of the temporary breeding cage; and floor roller drive means for vertically sliding each floor roller, independently, in the breeding cage and the temporary breeding cage. The temporary breeding cage has a floor roller holding member for internally holding the floor rollers.;COPYRIGHT: (C)2014,JPO&INPIT
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