A recording medium for thermal transfer printers includes: a base layer; a dye accepting layer applied to a surface of the base layer; and an inorganic material aid layer which is interposed between the base layer and the dye accepting layer. The inorganic material and layer contains an organic binder resin, an inorganic material having a particle diameter of 10 μm or greater and a brightening agent. The recording medium has the inorganic material aid layer interposed between the base and the dye accepting layer, which facilitates transfer of a recording ribbon dye. As a result, stain and wrinkle free and clear image quality can be obtained and light resistance can also be improved.