PROBLEM TO BE SOLVED: To provide a habitat that is optimized based on the behavior of a bait mite which is an alternative bait for natural enemies, realize the long-term growth and maintenance of the bait mites, and prolong the sedentary property of the natural enemies that prey on the bait mites. Providing improved protection against natural enemy insects over a period of time. A protective device for natural enemies, which maintains the growth of predatory mites that serve as food for natural enemies, thereby improving the settlement of the natural enemies, and having a bag-like or housing-like shape having a sealed space inside. The main body, an accommodating portion arranged in the sealed space, in which the natural enemy insects and bait mites can be stored in and out of the bag, and a member made of a moisture-retaining material having a controlled moisture release, the sealed space is a natural enemy. Insects can move in and out, water does not enter when water is sprayed on the body, the humidity can be maintained at 70% or more for 30 days or more, and the inside of the body forming a closed space A protector for natural enemy insects, which is configured to have a portion in which a surface and an outer surface of the accommodating portion are opposed to each other, the distance between them is 3.0 mm or less. [Selection diagram] Figure 1【課題】天敵昆虫の代替餌である餌ダニの習性に基づき最適化された生息環境を提供し、餌ダニの長期間にわたる増殖維持を実現し、餌ダニを捕食する天敵昆虫の定住性を長期間にわたって向上させた天敵昆虫の保護装置の提供。【解決手段】天敵昆虫の餌となる餌ダニの増殖を維持することで天敵昆虫の定住性を向上させた天敵昆虫の保護装置であって、内部に密閉空間を有する袋状又は筐体状の本体部と、前記密閉空間に配設された、袋体内に天敵昆虫及び餌ダニが出入り可能に収容された収容部と、徐放湿性の保水材からなる部材とを備え、密閉空間が、天敵昆虫が外部に出入り可能で、本体部に散水した場合に水が浸入せず、その湿度が７０％以上に３０日間以上維持可能に構成され、さらに、密閉空間を形成している本体部の内側表面と、収容部の外側表面とが対向する部分における両者の間隔が３．０ｍｍ以下である部分を有するように構成された天敵昆虫の保護装置。【選択図】図１
