A thermosensitive plate material for lithographic plate formation according to
the present invention includes a substrate (1) and a thermosensitive layer
(2) formed thereon. The thermosensitive layer (2) includes an organic
polymer (4) containing lipophilic portion forming particles (3).
In the thermosensitive layer (2), a surface portion (21) having a
thickness of 0.1 m or more does not contain the lipophilic portion forming
particles (3) but contains a metal oxide (5). The surface portion
(21) includes a hydrophilic organic polymer (41), which has been
cured with the metal oxide (5). A portion (22) of the thermosensitive
layer (2) on the substrate side contains the lipophilic portion forming
particles (3). The organic polymer (42) constituting the base portion
(22) need not be the hydrophilic organic polymer.
