PURPOSE: To form a recording image having high density and various excellent fastnesses even when heat energy is applied for a short time, by containing a specific dye in the dye support layer formed on one surface of a base sheet.

CONSTITUTION: A dye contained in a dye support layer is represented by formula [I] (wherein R1 is an alkyl group, an alkoxyoarhonyl group, an aryl group which may have a substituent or an amino group, R2 and R3 are a hydrogen atom, a halogen atom, an alkyl group, a cycloalkyl group, an alkoxy group, an acylamino group, an aminocarbonyl group, an alkylaryl group or an aryl group, R4 and R5 are an alkyl group which may have a substituent, an aralkyl group, an aryl group or a hydrogen atom and R6 is the same substituents as R2 or R3). The dye represented by the formula [I] is obtained by the coupling of p-phenylenediamine compound and pyrazolone imidazole.