It can be easily installed directly on the branches and leaves of crops that should be protected from the target pests, has a simple structure, and can efficiently and inexpensively multiply natural enemy insects that are natural enemies of pests. A natural enemy insect breeding device is provided. A natural enemy insect breeding apparatus 10 for propagating natural enemy insects, which are natural enemies of pests, is housed in a housing-like main body portion 11 having a space inside, and the natural enemy insects disposed in the space of the main body portion 11 are able to enter and exit. The natural enemy insect accommodating part 12 and the egg-laying part 13 which can be spawned by the natural enemy insects are provided in parallel with the natural enemy insect accommodating part 12 in the space of the main body part 11.設置対象である害虫から保護すべき作物の枝葉に直接容易に設置することが可能で、簡易な構成を有し、害虫の天敵となる天敵昆虫の増殖を効率よく安価に実現することが可能な天敵昆虫増殖装置を提供する。害虫の天敵となる天敵昆虫を増殖させる天敵昆虫増殖装置１０を、内部に空間を有する筐体状の本体部１１と、本体部１１の空間に配設された、天敵昆虫が出入り可能に収容された天敵昆虫収容部１２と、本体部１１の空間に、天敵昆虫収容部１２と並設された、天敵昆虫が産卵可能な産卵部１３とから構成する。
