[Issue] with a simple structure, to provide insects intrusion prevention device that can suppress the invasion of insects from the entrance section. In [MEANS FOR SOLVING PROBLEMS] insect intrusion prevention device 11, a waterway 13 groove opening is flush with the 25 floor provided so as to extend to the floor portion 21 over the opening frontage opposite end 19 of the inlet and outlet portion 17 of the building 27 , it was provided, a water supply pump 15 to flow to the 35 direction waterway other end the water in water supply to the waterway one end 33. In addition, it consists of 39 Metropolitan return waterway waterway 13 is the forward waterway 37, waterways and 39 constitute the waterway 13 which communicates Well connected by a waterway other end 35 backward and outward waterway 37, insect intrusion prevention device 11, return be water supply water was refluxed waterways end 33 of the channel 39 is circulated to the water channel 33 one end of the water channel 37 by the forward water supply pump 15 is preferred. [Selection] Figure Figure 1【課題】簡素な構造で、出入口部からの昆虫類の侵入を抑止できる昆虫類侵入防止装置を提供する。【解決手段】昆虫類侵入防止装置11において、建物27の出入口部17の開口間口方向両端19に渡る床部21に延在して設けられ溝開口が床面25と同一平面となる水路13と、水路一端部33に給水して水を水路他端部35方向へ流す給水ポンプ15と、を設けた。また、昆虫類侵入防止装置11は、水路13が往路水路37と復路水路39とからなり、往路水路37と復路水路39とが水路他端部35で接続さて連通した水路13を構成し、復路水路39の水路一端部33に還流した水が給水ポンプ15によって往路水路37の水路一端部33に循環して給水されることが好ましい。【選択図】 図1
