Photothermographic material and image forming method

A photothermographic material comprising, on at least one surface of a support, at least a photosensitive silver halide, a non-photosensitive organic silver salt, a reducing agent and a binder, wherein the photosensitive silver halide has a silver iodide content of 40 mol % or more, and the photothermographic material contains two or more kinds of the reducing agent at the mixing ratio to satisfy at least one of a) and b):

• a) a difference between a sensitivity when the photothermographic material has been imagewise exposed using a laser beam source and developed at 120° C. for 10 sec and a sensitivity when the photothermographic material has been imagewise exposed using a laser beam source and developed at 120° C. for 14 sec is 0.10 or less, wherein these sensitivities are expressed as a logarithm of a reciprocal of an exposure value;
• b) a difference between a maximum density when the photothermographic material has been imagewise exposed using a laser beam source and developed at 120° C. for 10 sec and a maximum density when the photothermographic material has been imagewise exposed using a laser beam source and developed at 120° C. for 14 sec is 0.10 or less.