To provide a wide-band anti-reflection film that has excellent spectral reflection characteristics in a wide band from the visible region to the infrared region with a wavelength of 400 to 900 nm, and consists of a small number of layers, such as five layers or six layers.SOLUTION: There is provided an anti-reflection film that has a first layer with a refractive index N1 of Nsub+0.02 to Nsub+0.22, a second layer with a refractive index N2 of 1.86 to 2.1, a third layer with a refractive index N3 of 2.1 to 2.6, a fourth layer with a refractive index N4 of 1.3 to 1.75, a fifth layer with a refractive index N5 of 2.1 to 2.6, and a sixth layer with a refractive index N6 of 1.1 to 1.4, formed on an optical base material with a refractive index Nsub of 1.42 or more and less than 1.815 in order from...

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