A near-infrared absorbing composition that contains a solvent and a copper-containing polymer which has a copper complex site in a polymer side chain, said copper complex site having a moiety that is to be monodentately coordinated to a copper atom, at least one counter ion selected from among counter ions for the copper complex skeleton, and a moiety that is to be multidentately coordinated to a copper atom, and wherein the copper atom in the copper complex site is bonded to the polymer main chain via the moiety that is to be monodentately coordinated to a copper atom or via the counter ion; a near-infrared blocking filter which uses this near-infrared absorbing composition; a method for producing this near-infrared blocking filter; an apparatus which comprises this near-infrared blocking filter; a copper-containing polymer which is suitable for use in the near-infrared absorbing composition; and a method for producing this copper-containing polymer.
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