A cover glass for photoelectric conversion devices, comprising: a glass sheet having surface asperities; and a reflection-reducing film formed over the surface asperities of the glass sheet, wherein the surface asperities of the glass sheet have an average spacing Sm as specified in JIS B 0601-1994 of 0.3 mm or more and 2.5 mm or less and an arithmetic average roughness Ra as specified in JIS B 0601-1994 of 0.3 μm to 5 μm, the reflection-reducing film includes fine silica particles having an average particle diameter corresponding to a cumulative volume of 50% in a particle size distribution measured by a particle size distribution method using laser diffraction of 50 to 200 nm and a binder for the fine silica particles, the fine silica particles are uniformly arranged in a single layer on peak portions of the surface asperities in such a manner that a filling fraction F is 35 to 65%, a transmittance gain is 2.37% or more, the transmittance gain being obtained by subtracting an average transmittance of the glass sheet as measured when light having wavelengths ranging from 380 to 1100 nm are incident on a face of the glass sheet that has the surface asperities, from an average transmittance of the cover glass as measured when light having the wavelengths are incident on a reflection-reducing film side of the cover glass, and the filling fraction F is defined by the following formula: F = A / B × 100, where A represents the number of the fine silica particles contained in a square region each of whose sides has a length that is 10 times the average particle diameter of the fine silica particles, and B represents the number of spheres filled in the square region when the spheres are assumed to have a diameter equal to the average particle diameter of the fine silica particles and to be arranged in closest packing in the square region, wherein, in valley portions of the surface asperities, the fine silica particles are stacked to a height corresponding to 1.5 to 2.1 times the average particle diameter of the fine silica particles. a glass sheet having surface asperities; and a reflection-reducing film formed over the surface asperities of the glass sheet, wherein the surface asperities of the glass sheet have an average spacing Sm as specified in JIS B 0601-1994 of 0.3 mm or more and 2.5 mm or less and an arithmetic average roughness Ra as specified in JIS B 0601-1994 of 0.3 μm to 5 μm, the reflection-reducing film includes fine silica particles having an average particle diameter corresponding to a cumulative volume of 50% in a particle size distribution measured by a particle size distribution method using laser diffraction of 50 to 200 nm and a binder for the fine silica particles, the fine silica particles are uniformly arranged in a single layer on peak portions of the surface asperities in such a manner that a filling fraction F is 35 to 65%, a transmittance gain is 2.37% or more, the transmittance gain being obtained by subtracting an average transmittance of the glass sheet as measured when light having wavelengths ranging from 380 to 1100 nm are incident on a face of the glass sheet that has the surface asperities, from an average transmittance of the cover glass as measured when light having the wavelengths are incident on a reflection-reducing film side of the cover glass, and the filling fraction F is defined by the following formula: F = A / B × 100, where A represents the number of the fine silica particles contained in a square region each of whose sides has a length that is 10 times the average particle diameter of the fine silica particles, and B represents the number of spheres filled in the square region when the spheres are assumed to have a diameter equal to the average particle diameter of the fine silica particles and to be arranged in closest packing in the square region, A represents the number of the fine silica particles contained in a square region each of whose sides has a length that is 10 times the average particle diameter of the fine silica particles, and B represents the number of spheres filled in the square region when the spheres are assumed to have a diameter equal to the average particle diameter of the fine silica particles and to be arranged in closest packing in the square region, wherein, in valley portions of the surface asperities, the fine silica particles are stacked to a height corresponding to 1.5 to 2.1 times the average particle diameter of the fine silica particles.