Infrared-light-transmitting ink of dark color, and infrared-light-reflecting sheet obtained using same

An infrared-light-reflecting sheet, comprising

• a plurality of layers laminated, the plurality of layers including at least a transparent adhesion layer and a reflective layer, wherein
• two layers among layers laminated between the transparent adhesion layer and the reflective layer are an infrared-light-transmitting dark color layer and a transparent adhesive layer,
• the infrared-light-transmitting dark color layer has a thickness of 15 μm or less and contains a first pigment and a second pigment,
• the first pigment is at least one or more pigments selected from the group consisting of a benzimidazolone pigment, 4-[(2,5-dichlorophenyl)azo]-3-hydroxy-N-(2,5-dimethoxyphenyl)-2-naphthalenecarboxamide, 1-[(4-nitrophenyl)azo]-2-naphthalenol, bis[3-hydroxy-4-(phenylazo)-2-naphthalenecarboxylic acid]copper salt, C. I. Pigment Brown 7, N,N′-bis(2,4-dinitrophenyl)-3,3′-dimethoxy-1,1′-biphenyl-4,4′-diamine, 3,4,9,10-perylenetetracarboxylic diimide, Δ2,2′ (1H,1′H)-binaphtho [2,1-b]thiophen-1,1′-dione, and N,N′-(10,15,16,17-tetrahydro-5,10,15,17-tetraoxo)-5Hdinaphtho[2,3-a:2′,3′-i]carbazole-4,9-diyl)bis(benzamide),
• the second pigment is a phthalocyanine pigment, and
• a color difference ΔE*ab between a color tone of the infrared-light-reflecting sheet and a color tone which is a* is 0.15 and b* is-0.48 as measured under conditions of a D65 light source and a 10° view angle according to JIS-Z 8722 is 10 or less
• wherein a reflection rate of the infrared-light-reflecting sheet is 50% or more when light having a wavelength of 1000 nm is incident to the infrared-light-reflecting sheet, and a reflection rate of the infrared-light-reflecting sheet is 50% or less when light having a wavelength of 750 nm is incident to the infrared-light-reflecting sheet.