Hair dye composition

A hair dye composition comprising, a direct dye compound of formula (1):

• wherein, R1 and R2 each independently represent a hydrogen atom or a C1-6 alkyl group which may have a substituent;
• A represents a group of formula (2):
• wherein R3, R4 and R5 each independently represent a C1-6 alkyl group which may have a substituent, or R4 and R5 may be coupled together to form a cyclic structure, benzene ring a1 may have a substituent other than a sulfonic acid group or may be condensed with an aromatic ring, or
• A is a group of formula (3):
• wherein W represents an aralkyl group, a carbamoylalkyl group or —T—NR6R7, wherein R6 and R7 each independently represent a C1-6 alkyl group which may have a substituent, an aromatic group which may have a substituent or a heterocyclic group which may have a substituent, or R6 and R7 may form a heterocyclic ring together with the adjacent nitrogen atom, and T represents a divalent linear C1-4 hydrocarbon group which may have a substituent, pyridine ring a2 may be condensed with an aromatic ring,
• B represents a group represented by the formula —Z1, —NR8—Z1 or —CH═Z2
• wherein when A is a group of formula (3) Z1 represents an aromatic or heterocyclic aromatic group which may have a substituent, R8 represents a hydrogen atom, a C1-4 alkyl group which may have a substituent or an aromatic group which may have a substituent or R8 and Z1 may be coupled together to form a nitrogen-containing heterocyclic group which may have a substituent, Z2 represents a divalent group obtained by removing two hydrogen atoms from the methylene group on the ring of a heterocyclic aromatic compound which may have a substituent,
• wherein when A is a group of formula (2) R8 represents a hydrogen atom, a C1-4 alkyl group which may have a substituent or an aromatic group which may have a substituent or R8 and Z1 may be coupled together to form a nitrogen-containing heterocyclic group which may have a substituent, Z2 represents a divalent group obtained by removing two hydrogen atoms from the methylene group on the ring of a heterocyclic aromatic compound which may have a substituent, and Z1 may have a substituent and is selected from the group consisting of
• with the proviso that when A is a group of formula (2), B represents the group —Z1 and Z1 represents an aromatic group or when A is a group of formula (2), B represents the group —CH═Z2, Z2 represents an indolinidene group and n does not stand for 0, the aromatic group or indolinidene group has at least one substituent represented by the formula:
• —NR9R10 wherein R9 represents a C1-4 alkyl group having as a substituent a chlorine atom or a cyano, an acylamino, an alkoxy, a monoalkylamino, a dialkylamino, a trimethylammoniumyl group, or a phenyl group which may have a substituent and R10 represents a C1-6 alkyl group which may have a substituent,
• n stands for an integer of 0 to 3, wherein when B represents the group —Z1 or group —NR8—Z1 n is 1 to 3 and when B represents the group —CH═Z2 n is 0 to 3;
• and
• Y31 stands for an anion.