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An object of the present invention is to provide an infraredshielding nanopartlcle dispersion that has a property whereby visible light is adequately transmitted, and light in the near-infrared region is adequately shielded; an infraredshielding body manufactured using the infrared-shlelding nanoparticle dispersion; a method for manufacturing infraredshielding nanoparticles that are used in the infraredshielding nanoparticle dispersion; and infrared-shlelding nanopartlcles manufactured using the method for manufacturing infrared-shielding nanoparticles. The present invention is a method for manufacturing infrared-shlelding nanoparticle dispersion obtained by dispersing infrared-shleldlng nanoparticles in a medium, an infrared-shielding body manufactured by using the infrared-shielding nanopartlcle dispersion, and infrared-shieldlng nanoparticles used in the infrared-shielding nanoparticle dispersion, wherein the infrared-shleldlng nanopartlcles include a substance expressed by the general formula MxA W( 1 .y)O 3 (where M is one or more elements selected from H, He, alkali metals, alkaline-earth metals, rare earth elements, Mg, Zr, Cr, Mn, Fe, Ru, Co, Rh, It, Ni, Pd, Pt, Cu, Ag, Au, Zn, Cd, AI, Ga, In, T1, Si, Ge, Sn, Pb, Sb, B, F, P, S, Se, Br, Te, Ti, Nb, V, Mo, Ta, Re, Be, Hf, Os, Bi, and I; A is one or more elements selected from Mo, Nb, Ta, Mn, V, Re, Pt, Pd, and Ti; W is tungsten; O is oxygen; 0 <