A composition includes at least two aromatic carboxylic acid compounds selected from the group consisting of aromatic carboxylic acid compounds of formulas (I), (II) and (III) as specified in the specification. A thermosensitive recording material has a support, and a thermosensitive coloring layer formed thereon which contains a leuco dye and a color developer capable of inducing color formation in the leuco dye upon application of heat thereto, with the color developer comprising the aforementioned composition of the aromatic carboxylic acid compounds.