PROBLEM TO BE SOLVED: To provide a pest controlling device which can perform local irradiation of ultraviolet light with respect to the plants, and which has an excellent controlling effect of pests.SOLUTION: A pest controlling device controls pests of plants and it includes: a portable housing 30； and a light source 20 held in the housing 30, and for emitting ultraviolet light in a predetermined direction. The housing 30 has an installation structure 31 so that it is installed at a culture medium for plants with a predetermined direction facing upward.SELECTED DRAWING: Figure 3【課題】植物に対する局所的な紫外光の照射が可能であり、かつ、病害虫の防除効果に優れた病害虫防除装置を提供する。【解決手段】植物の病害虫を防除する病害虫防除装置であって、可搬性の筐体３０と、筐体３０に保持され、紫外光を所定方向に出射する光源２０とを備え、筐体３０は、所定方向が上向きになるように植物の培地に設置される設置構造３１を有する。【選択図】図３
