Provided is a thermally sensitive recording medium which exhibits high
recording sensitivity, high heat resistance of ground color part and
excellent preserving stability of images. A thermally sensitive recording
medium, comprising a thermally sensitive recording layer containing a
colorless or pale colored basic colorless dye and an organic color
developing agent as main components on a substrate, wherein said
thermally sensitive recording layer contains at least one compound
represented by general formula (1) and contains at least one compound
selected from the group consisting of
3-{[(phenylamino)carbonyl]amino}benzensulfoneamide represented by formula
(2), an ureaurethane compound represented by formula (3) and a copolymer
of glysidilmethacrylate and vinyl monomer (average molecular weight is
9000-11000, epoxy equivalent is 300-600 and melting point is 110.degree.
C. or less) as a stabilizer. ##STR00001## (in the formula, R.sub.1 is a
hydrogen atom, a halogen atom, an alkyl group or alkoxy group)
##STR00002## As a color developing agent a compound represented by
general formula (4) is desirable. ##STR00003## (in the formula, R.sub.2
is an alkyl group of carbon number 1-4, an alkoxy group, a phenyl group
or a hydrogen atom).