An insect-repelling film or sheet which has a reflective spectrum in the ultraviolet region at a wavelength of less than 0.4 mu m, particularly a reflective spectrum peak at a wavelength of less than 0.4 mu m, a reflective spectrum with a ratio RA/RB of not less than 1.4 wherein RA is the ultraviolet reflectance and RB is the visible light reflectance at a wavelength of 0.5 mu m, and a visible light transmission of not less than 40 %,is useful as a cover for greenhouses and tunnels or for mulching of the ground for crop culture or as a repellent for various insect pests in agriculture, forestry and gardening.