Diazo heat-sensitive recording material comprising hydroxy coumarin as a coupler

A diazo heat-sensitive recording material comprising a support having thereon a recording layer comprising a diazo compound, a coupling component and an organic base, wherein said diazo compound is a diazonium salt represented by the following general formula (I) and said coupling component is a compound represented by the following general formula (II):

• ##STR8## wherein R.sub.1, R.sub.2 and R.sub.3 each represents an alkyl group, an aralkyl group or an aryl group;
• R.sub.2 and R.sub.3 may form a ring together with the nitrogen atom in formula (I) adjacent to R.sub.2 and R.sub.3 ;
• and X represents an acid anion, ##STR9## wherein R.sub.4, R.sub.5, R.sub.6 and R.sub.7, which may be the same or different, each represents a hydrogen atom, an alkyl group, an aryl group, an aralkyl group, an alkyloxy group, an aryloxy group, an alkylthio group, an arylthio group, an acyl group, an alkoxycarbonyl group, an acyloxy group, a carbamoyl group, a sulfamoyl group, a halogen atom, a cyano group or a nitro group;
• and R.sub.4 and R.sub.5, R.sub.5 and R.sub.6, or R.sub.6 and R.sub.7 may be combined with each other to form a ring.