Optical filter

The invention relates to an optical filter. Provided is an optical filter having excellent transmissivity for near-infrared light of 800 nm or more and excellent barrier properties for visible light of 400-680 nm. An optical filter having a base material and a dielectric multilayer film laminated on at least one main surface side of the base material as an outermost layer, the dielectric multilayer film being a laminate in which low refractive index films and high refractive index films are alternately laminated, at least one of the low refractive index film and the high refractive index film satisfies the following optical characteristics (i-1) and (i-2A), and the optical filter satisfies the following optical characteristic (ii-1A). (i-1) the extinction coefficient k600 at a wavelength of 600 nm is 0.12 or more; (i-2A) the minimum extinction coefficient (k1530 to 1570 MIN) in the wavelength range of 1530 nm to 1570 nm is 0.01 or less; (ii-1A) blocks light having a wavelength of 400 nm ...