PROBLEM TO BE SOLVED: To provide an air filter that can efficiently catch insects and dust by the combined use with a blowing fan, and is hard to cause the clogging of a filter base material, furthermore, is hard to cause the deformation of the filter base material even when enlarging the filter base material or using a high power blowing fan, and provide an air cleaner, an insect trap and a ventilation structure of a building using the air filter.SOLUTION: An air filter is configured such that a filter base material of the air filter uses a three-dimensional reticulated plate of a three-dimensional network structure formed by joining and integrating a rigid continuous linear body of a winding shape, or a porous plate forming a sponge-shaped three-dimensional network structure comprising metallic materials, ceramic materials, hard plastic materials, etc., and pressure-sensitive adhesives are attached in the inside of the filter base material formed in a plate thickness of 10 mm or more.SELECTED DRAWING: Figure 2【課題】 送風ファンとの併用により羽虫や塵埃を効率的に捕獲することができ、またフィルタ基材の目詰まりも生じ難く、しかも、フィルタ基材を大型化する場合や高出力の送風ファンを使用する場合でもフィルタ基材の変形が起き難いエアフィルタ、及びそのエアフィルタを用いた空気清浄器、捕虫器及び建築物の換気構造を提供すること。【解決手段】 エアフィルタのフィルタ基材に、曲りくねった形状の剛直な連続線状体を接合一体化して成る三次元網目構造の立体網状板、若しくは金属材料やセラミック材料、硬質のプラスチック材料等から成る海綿体状の三次元網目構造を成す多孔質板を使用すると共に、板厚10mm以上に形成された前記フィルタ基材の内部に粘着剤を付着させてエアフィルタを構成した。【選択図】 図２
