To provide an antifogging agent capable of imparting long-term antifogging property to an agricultural film. A coating type antifogging agent for agricultural films, comprising (A) colloidal inorganic fine particles, (B) water-soluble alkali metal silicate, and (C) synthetic resin, wherein (A) colloidal inorganic fine particles have a solid content. A coating type anti-fog for agricultural films in which the solid content of (B) water-soluble alkali metal silicate is 30 to 150 parts by mass and the solid content of (C) synthetic resin is 30 to 150 parts by mass with respect to 100 parts by mass. Agent.農業用フィルムに長期防曇性を付与することができる防曇剤を提供すること。（Ａ）コロイド状無機微粒子、（Ｂ）水溶性アルカリ金属ケイ酸塩及び（Ｃ）合成樹脂を含有する農業用フィルム用塗布型防曇剤であって、（Ａ）コロイド状無機微粒子の固形分１００質量部に対し、（Ｂ）水溶性アルカリ金属ケイ酸塩の固形分が３０～１５０質量部、（Ｃ）合成樹脂の固形分が３０～１５０質量部である農業用フィルム用塗布型防曇剤。
