A composition, which is an infrared sensitive color-forming composition containing a compound represented by the formula A-B1-C1 wherein A is a thermochromic skeleton, B1 is a single bond or a connecting group, and C1 is an infrared absorbing skeleton, wherein the connecting group B1 is selected from the following structures: wherein * represents a site which connects to the thermochromic skeleton, ** represents a site which connects to the infrared absorbing skeleton, f, g and h each represents an integer from 1 to 6, i, j, k and 1 each represents an integer from 0 to 6; D represents -N(Ra)-, -O-, -S- or -C(Rb)(Rc)-, and Ra, Rb and Rc each represents a hydrogen atom or an alkyl group; and the infrared absorbing skeleton C1 is a cyanine dye of formula: wherein R 1 is H, halogen, -OR 10, -N(R 11)(R 12) or -SR 13, R 10 and R 13 each are alkyl or aryl, R 11 and R 12 each are H, alkyl or aryl, or R 11 and R 12 may be combined with each other to form a ring, R 2 and R 3 each are H or alkyl, or R 2 and R 3 may be combined with each other to form a ring, Ar 1 and Ar 2 each are an atomic group necessary for forming a benzene ring or a naphthalene ring, Y 1 and Y 2 each are S or dialkylmethylene, R 4 and R 5 each are alkyl, Za is a counter ion for neutralizing an electric charge, and the cyanine dye residue is connected to the thermochromic skeleton in R 1; and a binder, a compound represented by the formula A-B1-C1 wherein A is a thermochromic skeleton, B1 is a single bond or a connecting group, and C1 is an infrared absorbing skeleton, wherein the connecting group B1 is selected from the following structures: wherein * represents a site which connects to the thermochromic skeleton, ** represents a site which connects to the infrared absorbing skeleton, f, g and h each represents an integer from 1 to 6, i, j, k and 1 each represents an integer from 0 to 6; D represents -N(Ra)-, -O-, -S- or -C(Rb)(Rc)-, and Ra, Rb and Rc each represents a hydrogen atom or an alkyl group; and the infrared absorbing skeleton C1 is a cyanine dye of formula: wherein R 1 is H, halogen, -OR 10, -N(R 11)(R 12) or -SR 13, R 10 and R 13 each are alkyl or aryl, R 11 and R 12 each are H, alkyl or aryl, or R 11 and R 12 may be combined with each other to form a ring, R 2 and R 3 each are H or alkyl, or R 2 and R 3 may be combined with each other to form a ring, Ar 1 and Ar 2 each are an atomic group necessary for forming a benzene ring or a naphthalene ring, Y 1 and Y 2 each are S or dialkylmethylene, R 4 and R 5 each are alkyl, Za is a counter ion for neutralizing an electric charge, and the cyanine dye residue is connected to the thermochromic skeleton in R 1; and * represents a site which connects to the thermochromic skeleton, ** represents a site which connects to the infrared absorbing skeleton, f, g and h each represents an integer from 1 to 6, i, j, k and 1 each represents an integer from 0 to 6; D represents -N(Ra)-, -O-, -S- or -C(Rb)(Rc)-, and Ra, Rb and Rc each represents a hydrogen atom or an alkyl group; and the infrared absorbing skeleton C1 is a cyanine dye of formula: wherein R 1 is H, halogen, -OR 10, -N(R 11)(R 12) or -SR 13, R 10 and R 13 each are alkyl or aryl, R 11 and R 12 each are H, alkyl or aryl, or R 11 and R 12 may be combined with each other to form a ring, R 2 and R 3 each are H or alkyl, or R 2 and R 3 may be combined with each other to form a ring, Ar 1 and Ar 2 each are an atomic group necessary for forming a benzene ring or a naphthalene ring, Y 1 and Y 2 each are S or dialkylmethylene, R 4 and R 5 each are alkyl, Za is a counter ion for neutralizing an electric charge, and the cyanine dye residue is connected to the thermochromic skeleton in R 1; and a binder,