Thermal transfer sheet

A thermal transfer sheet comprising a substrate sheet and a dye layer provided on one surface of said substrate sheet, said dye layer comprising a binder and a dye represented by the following formula 1 and at least one dye selected from those represented by the following formulae 2 to 16:

• ##STR24## wherein R.sub.1 and R.sub.2 represent a substituted or unsubstituted alkyl group, a cycloalkyl group, or an aralkyl group, R.sub.3 represents an alkyl group, an alkoxy group, an alkylcarbonylamino group, an alkylsulfonylamino group, an alkylaminocarbonyl group, an alkylaminosulfonyl group, a hydrogen atom, or a halogen atom, R.sub.4 represents an alkoxycarbonyl group, an alkylaminocarbonyl group, an alkoxy group, an aryloxy group, an alkyl group, a cycloalkyl group, a heterocyclic group, a hydrogen atom, or a halogen atom, R.sub.5 represents an alkyl group, an alkoxycarbonyl group, an alkylaminocarbonyl group, an alkoxy group, an alkylaminosulfonyl group, a cycloalkyl group, a cyano group, a nitro group, a halogen atom, or a hydrogen atom, R.sub.6 represents a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted amino group, a cycloalkyl group, a cyano group, a nitro group, or a halogen atom, R.sub.7 represents an aryl group, an aromatic heterocyclic group, a cyano group, a nitro group, a halogen atom, or other electron-withdrawing groups, R.sub.8 represents an alkyl group, a cycloalkyl group, or an NR.sub.10 R.sub.11 group wherein R.sub.10 and R.sub.11 represent an alkylcarbonyl group or an arylcarbonyl group, R.sub.9 represents an amino group or a hydroxyl group, and l, m, and n are an integer of 1 to 4.