PROBLEM TO BE SOLVED: To provide an owl nest box inducing an owl to build a nest so that the owl comfortably builds the nest and breeds.SOLUTION: The owl nest box 1 includes an opening 11 of which the owl uses for entering and leaving on the side of the box. An -H side opening edge 11a of the opening 11 is formed substantially horizontal. In the owl next box 1, the height from an inner side bottom surface 35a to the -H side opening edge 11a of the opening 11 is ≥300 mm and ≤400 mm.COPYRIGHT: (C)2012,JPO&INPIT【課題】フクロウの営巣を誘引し、フクロウが快適に営巣および繁殖できるフクロウ用巣箱を提供する。【解決手段】フクロウが出入りする開口部11を側面に有するフクロウ用巣箱1であって、開口部11の-H側開口縁部11aは、略水平に形成されており、フクロウ用巣箱1の内側底面35aから開口部11の-H側開口縁部11aまでの高さが300mm以上400mm以下の範囲にあることを特徴とする。【選択図】図1