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

An infrared-light-reflecting sheet obtained by laminating a plurality of layers, the plurality of layers including at least:

• a transparent adhesion layer transmitting light beams;
• and
• a reflective layer reflecting light,
• 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 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)-5H-dinaphtho[2,3-a:2′,3′-i]carbazole-4,9-diyl)bis(benzamide), and
• the second pigment contains a phthalocyanine pigment,
• wherein a light reflection rate of the infrared-light-reflecting sheet is less than 15% when light having a wavelength of 700 nm to 750 nm is incident to the infrared-light-reflecting sheet.