PROBLEM TO BE SOLVED: To provide a beetle pupation room capable of saving trouble and downsizing a container (2), as a result of a larva (4) of a beetle voluntarily entering the container (2), and of enabling easy observation of transformation at a low cost.SOLUTION: By producing a state where a container (2) and a larva (4) of a beetle are placed on a breeding mat (3) composed of leaf mold, etc., the larva (4) of a beetle on the verge of pupation is made to enter the container (2) voluntarily, thereby completing a pupation room where transformation can be easily observed.COPYRIGHT: (C)2015,JPO&INPIT【課題】カブトムシの幼虫(4)自ら容器(2)に進入するため、手間が省けるだけでなく、容器(2)も小型化でき、低コストにて変態観察を容易にする蛹室を提供する。【解決手段】腐葉土等の飼育マット(3)に、容器(2)とカブトムシの幼虫(4)の入った状態にすることで、蛹化直前を向えたカブトムシの幼虫(4)自ら容器(2)の中に進入させ、変態観察を容易にする蛹室を完成させることを特徴とする。【選択図】図1