To provide a heat developable photosensitive material excellent in dimensional stability and silver tone and free from the increase of fog with the lapse of time.

The heat developable photographic sensitive material has a photosensitive layer containing an organic silver salt, photosensitive silver halide grains and a reducing agent on a polyester substrate derived from a cycloaliphatic diol and an aromatic dicarboxylic acid and has a non- photosensitive layer next to the photosensitive layer on the substrate side and the amount of silver of the photosensitive silver halide grains is 0.03-0.3 g/m2.