PROBLEM TO BE SOLVED: To provide a method for imparting easily and effectively one or more of antibacterial, algicidal or antifungal properties to the surface of an agricultural greenhouse.SOLUTION: Materials containing copper (copper powder, copper net, copper tape, copper wire or copper piece) is installed outside an agricultural greenhouse, and the materials are brought into contact with water, which allows copper ions to elute in water so that the copper ions are on the surface of the agricultural greenhouse. Thus, one or more of antibacterial, algicidal or antifungal properties are imparted to the surface of the agricultural greenhouse.SELECTED DRAWING: Figure 1【課題】農業用ハウスの表面に抗菌性、防藻性又は防カビ性のいずれか１以上の特性を簡易にかつ効果的に付与する方法を提供すること。【解決手段】銅を含んでなる資材（銅粉、銅網、銅テープ、銅線又は銅片）を農業用ハウスの外側に設置し、資材を水と接触させることで銅イオンを水に溶出させて農業用ハウスの表面に銅イオンを存在させることにより、農業用ハウスの被覆資材の表面に抗菌性、防藻性又は防カビ性のいずれか１以上の特性を付与する。【選択図】図１
