To provide a small biological observation container suitable for nature observation of [ challenges ] , such as children . It consists of case 2 and the Metropolitan [MEANS FOR SOLVING PROBLEMS ] aquarium , the cube -shaped wrap the aquarium , so providing a small window for observation of various shapes to multiple surface one side or the side of the case 2 . [ Selection ] Figure Figure 1【課題】子供等の自然観察に適した小生物観察容器を提供する。【解決手段】水槽と、水槽を包むキューブ状のケース2とからなり、ケース2の側部一面又は複数面に各種形状の観察用小窓を設けるようにする。【選択図】図1