a thermosensitive recording material having a high whiteness and capable of forming thereon colored images having an excellent oil and plasticizer resistance and persistency over a long time , comprises a thermosensitive colored image forming layer formed on a sheet substrate and comprising , together with a dye precursor and a binder , a color - developing agent comprising at least one compound of the formulae to . ## str1 ## wherein r 1 = h , alkyl , aryl , aralkyl , alkenyl or cycloalkyl , r 2 and r 3 = h , alkyl , aryl aralkyl , alkenyl or acetyl , or are fuse - bonded to form a cyclic structure , r 4 = alkyl , aryl , aralkyl , alkenyl , piperidino , succinimide , ρ - benzylphenyl , etc ., r 5 and r 6 = h , alkyl , aryl , aralkyl , alkenyl cycloalkyl , etc ., or are fuse - bonded to form ## str2 ## r 7 , r 9 , and r 11 = unsubstituted or substituted aromatic groups with alkyl , alkoxyl , acyl , etc ., r 8 , r 10 and r 12 = unsubstituted or substituted alkyl , aryl , aralkyl or alkenyl with alkyl , alkoxyl , acyl , nitro or halogen , and r 13 = h or unsubstituted or substituted alkyl , aryl aralkyl or alkenyl with alkyl , alkoxyl , acyl , nitro or halogen .