The present invention provides a photothermographic material including at
least a photosensitive silver halide, a non-photosensitive
silver-supplying compound, a reducing agent and a binder on at least one
surface of a support. The photothermographic material further includes at
least one kind of halogen releasing compound having a water-solubilizing
group and at least one kind of halogen releasing compound having no
water-solubilizing group, and a gradation of a characteristic curve is
2.5 to 4.0. The photothermographic material of the invention is excellent
in storability, and particularly excellent in storability of high quality
images used for image recording for medical diagnosis.