A thermal transfer image receiving sheet including a substrate having a surface, a heat-insulating layer formed on the surface, an undercoat layer formed on the heat-insulating layer, and a dye-receiving layer formed on the undercoat layer. The undercoat layer includes as a main component a polycondensate made from i) at least one of an alkoxide, a hydrolyzate of an alkoxide, and tin chloride, ii) a water-soluble polymer, iii) a vinyl pyrrolidone-vinyl imidazole copolymer, and iv) a urethane resin.