THERMAL TRANSFER SHEET

PROBLEM TO BE SOLVED: To obtain a high quality image capable of coping with the improvement of image forming speed by incorporating sulfonic acid salt-containing polyvinylacetal resin and inorganic pigment in a heat resistance glide layer. SOLUTION: The thermal transfer sheet is formed by dispersing about 5.0 pts.wt. of sulfonic acid salt-containing polyvinyl acetal resin as binder resin in a heat resistance glide layer 3, about 1.0 pts.wt. of polyisocyanate compound as an additive, about 1.0 pts.wt. of silicone oil as a lubricant, and about 0.5 pts.wt. of calcium carbonate of an average grain diameter of 0.04 μm as an inorganic pigment in a solvent consisting of about 41.5 pts.wt. of methylethyl ketone and toluene respectively, and thereby preparing a heat resistance layer forming composition. In this manner, a superior photographic image can be obtained having no sticking caused by head melting or drop of a photographic image due to dropping of adhered matter on the head.