The filter attaching cover assembly body for the cage (20) being, the filter attaching cover assembly body (20) the cover which has the perforated top wall (100) it possessed, the filter paper where the perforated top wall is laid out in that upper part (200) it reached the point conservation, the filter attaching cover assembly body. The hole (120), although the fact that it reaches to the position where it can grasp the animal is obstructed at the same time it is sufficiently small and the hole (120) although it obstructs Bite mu, in order to be sufficient, placing interval, the interval part between mutual it is good to be able to provide. The cover (100), the filter paper (200) or more containment in a state where it is floated in the upper part of the cover the tubercle rib of one or two (142,144) furthermore it is good to possess.< Choice figure >Drawing 1ケージ用のフィルタ付蓋組立体(20)であって、フィルタ付蓋組立体(20)が有孔頂壁を備えた覆い(100)を有し、有孔頂壁がその上方に配置されたフィルタペーパ(200)を保護するようになった、フィルタ付蓋組立体。孔(120)は、動物が掴める位置に達するのを阻止するのに十分に小さく且つ孔(120)相互間の間隔部分を噛むのを阻止するのに十分なように間隔を置いて設けられるのが良い。覆い(100)は、フィルタペーパ(200)を覆いの上方に浮かした状態に保持する1つ又は2つ以上の隆起リブ(142,144)を更に有するのが良い。【選択図】図1
