Abstract: A thermally sensitive recording medium characterized to be superior in writing aptitude, printing aptitude, causes less head debris, possesses good water resistance, causes less sticking and is excellent in preservative stability of developed color in nature environment such as heat, water, humid or light, to sebum when handled with hand, oils, plasticizers and solvents can be obtained by following method, that is, a method for preparation of a thermally sensitive recording medium possessing a coating layer formed by applying a coating (A) containing a binder and a coating (B) containing a crosslinking agent on a thermally sensitive recording layer, which is formed on a substrate, and said thermally sensitive recording layer contains a colorless or pale colored electron donating leuco dye and an electron accepting color developing agent comprising, forming an over coating layer by applying said coating (A) and coating (B) separately in accordance with a curtain coating method, wherein the formation of the ove