Disclosed is a heat-sensitive recording material comprising a base sheet, a heat-sensitive record layer formed over the base sheet and a water-soluble resin protective layer formed over the heat-sensitive record layer, characterized in that the protective layer contains at least one compound selected from the group consisting of polyaluminumhydroxide represented by the formulas[Al.sub.2 (OH).sub.a X.sub.6-a ].sub.n (I)[Al.sub.2 (OH).sub.a (SO.sub.4).sub.(6-a)/2 ].sub.n (II)wherein X represents halogen ion or NO.sub.3.sup.-, O