PROBLEM TO BE SOLVED: To provide a net entry prevention tool which is capable of preventing an insect proof net from entering a room side of a vinyl house when closing a window, which is not fatigued even in the case where opening/closing of a window is repeated, and which is hardly broken.SOLUTION: A net entry prevention tool 6 prevents entry of an insect proof net 4 into a vinyl house, the insect proof net being bridged between an opening side frame 3b of a window frame 10 of a window 3 whose one end is attached so as to oscillate freely to an attachment frame 2 attached to a vinyl house, and an opening side crosspiece 2a of the attachment frame facing the opening side frame. The net entry prevention tool comprises an entry prevention part 7 whose upper end is attached to inside of the vinyl house, relative to the insect proof net of the opening side frame of the window frame, and faces the opening side crosspiece of the attachment frame always. The entry prevention part is stored in the vinyl house when a window is closed.SELECTED DRAWING: Figure 2【課題】窓を閉じる際に防虫ネットがビニールハウスの室内側に侵入するのを防止できると共に、窓の開閉を繰り返しても疲労せず、破損しにくいネット侵入防止具を提供する。【解決手段】ビニールハウスに取り付けられる取付枠２に一端が揺動可能に取り付けられる窓３の窓枠１０の開口側框３ｂと開口側框に対向する取付枠の開口側桟２ａとの間に架け渡される防虫ネット４のビニールハウス内への侵入を防止するネット侵入防止具６において、上端が窓枠の開口側框の防虫ネットよりもビニールハウス内側に取り付けられて、常に取付枠の開口側桟に対向する侵入防止部７を備え、侵入防止部は、窓が閉じられると上記ビニールハウス内に収容される。【選択図】図２
