PURPOSE: To obtain a plate making material capable of forming a lithographic plate superior in pressure resistance, easy to handle, and causing low stains, by forming a specified pressure alleviating layer, and using a support having specified volume resistivity.

CONSTITUTION: A photoconductive layer is formed on a substrate. A pressure alleviating layer is formed on at least one side of the substrate. It has ≤2× 1010dyne/cm2 Young's modulus. The substrate has ≤1010Ωcm volume resistivity. As the main component of the pressure alleviating layer, polyethylene, polypropylene, natural rubber, SBR rubber, ABS rubber, fluorinated resin, etc. are suitable. A suitable thickness of the pressure alleviating layer is 5W50μm.