Disclosed is a printing plate precursor comprising a substrate and provided
thereon, a layer containing a light heat conversion material, wherein the
light heat conversion material does not substantially change in nature
when allowed to stand in a temperature atmosphere of 400 to 500.degree. C.
for 10 minutes or a printing plate precursor comprising a substrate and
provided thereon, a hydrophilic layer which is porous, wherein the
hydrophilic layer contains a carbon atom-free material in an amount of not
less than 91% by weight.
