The present invention, there is provided a laboratory animal for positioner 1 for retaining the experimental animals, a predetermined distance in at least one of the left or right from the center line L1, which comprises a body 2 of the plate, passing through the center C of the main body 2 The position I is characterized in that the hind hole 4 having a diameter capable of passing through the knee is provided with at least the hind limb of the experimental animals.本発明は、実験動物を保定する実験動物用保定器1であって、板状の本体2を備え、本体2の中心Cを通る中心線L1から左右いずれかの少なくとも一方に所定の距離離れた位置には、実験動物の後肢が少なくとも膝まで通過可能な径を有する後肢用孔4が設けられていることを特徴とする。
