A thermosensitive recording material which comprises a support material and a thermosensitive color-forming layer formed on the support material, comprising a colorless or light-colored leuco dye and a color developer capable of inducing color formation in the leuco dye upon application of heat thereto, is disclosed, in which the color developer is 4-hydroxydimethylphthalate or a first bisphenol derivative of the formula (I) ##STR1## wherein n is an integer of 1 or 2, and there is interposed between the support material and the thermosensitive color-forming layer an undercoated layer comprising a second bisphenol derivative of the formula (II), ##STR2## wherein X represents halogen, Y represents --SO.sub.2 --or-- ##STR3## m is an integer of 1 or 2, and the substitution positions of Xm in the benzene rings are symmetrical with respect to Y.