PROBLEM TO BE SOLVED: To provide an antifouling film capable of suppressing fogging of an endoscope lens and adhesion of blood or the like to the lens with a simpler configuration. An antifouling film 20 is attached to the surface of a lens 12 and includes a network structure in which a plurality of nanofibers are entangled, and oil impregnated in the network structure. [Selection diagram] Fig. 2【課題】内視鏡のレンズの曇り、レンズへの血液等の付着を、より簡素な構成で抑制できる防汚膜を提供すること。【解決手段】防汚膜２０は、レンズ１２の表面に装着され、複数のナノファイバーが絡み合った網目構造体と、前記網目構造体に含侵された油と、を備える。【選択図】図２
