This invention discloses a heat sensitive recording sheet which contains, as a developer, at least one of the compounds represented by the general formula ##STR1## where R represents hydrogen, an alkyl radical of from 1 to 12 carbon atoms, a cycloalkyl radical of from 3 to 10 carbon atoms, an aralkyl radical of from 7 to 10 carbon atoms, and a phenyl radical, and may be identical to or different from each other, n is zero, or an integer of 1 or 2.The heat sensitive recording sheet of this invention has a sharper rise in developed color density and is advantageous for its handling and storage as well as gives a developed color image having an excellent fastness to light and water resistance in addition to very little decrease in density of the developed color image with time.