To provide DTR material having excellent printing properties in the case of being processed in an exhausted activator, and a DTR method.

An image forming element contains a silver halide emulsion layer and an image receiving layer containing colloid clay as well as physical developing nuclei in water permeable contact with the silver halide emulsion layer, on a support body. A planographic printing plate manufacturing method includes a process of exposing the image forming element defined in this case and then developing the image forming element, exposed according to an image, using an alkaline processing solution under the presence of a developer and a silver halide solvent.