WHAT IS CLAIMED IS:
1. A printing plate precursor comprising:
a support;
a layer which contains a polymer on one side of the support; and
a layer which contains a metal oxide obtained by hydrolyzing and polycondensing an organic metal compound or an inorganic metal compound and fine particles on other side of the support,
wherein an average particle diameter of the fine particles is 0.3 |nm or greater and is greater than a thickness of the layer containing the metal oxide and the fine particles.
2. The printing plate precursor according to claim 1,
wherein the fine particles are fine particles having a hydrophilic surface.
3. The printing plate precursor according to claim 2,
wherein the fine particles having a hydrophilic surface are at least one selected from organic resin fine particles having a hydrophilic surface and inorganic fine particles having a hydrophilic surface.
4. The printing plate precursor according to claim 3,
wherein the organic resin fine particles having a hydrophilic surface are organic resin fine particles coated with at least one inorganic compound selected from silica, alumina, titania, and zirconia.
5. The printing plate precursor according to claim 3 or 4,
wherein the organic resin fine particles having a hydrophilic surface are organic resin fine particles coated with silica.
6. The printing plate precursor according to any one of claims 3 to 5,
wherein an organic resin constituting the organic resin fine particles having a hydrophilic surface is at least one resin selected from a polyacrylic resin, a polyurethane resin, a polystyrene resin, a polyester resin, an epoxy resin, a phenolic resin, and a melamine resin.
7. The printing plate precursor according to any one of claims 1 to 6,

wherein the layer containing the polymer is a positive image recording layer containing an infrared absorbent.
8. The printing plate precursor according to any one of claims 1 to 6,
wherein the layer containing the polymer is a negative image recording layer containing an infrared absorbent, a polymerization initiator, and a polymerizable compound.
9. The printing plate precursor according to any one of claims 1 to 6,
wherein the layer containing the polymer is a negative image recording layer containing an infrared absorbent, a polymerization initiator, a polymerizable compound, and a polymer compound having a fine particle shape.
10. The printing plate precursor according to any one of claims 1 to 6,
wherein the layer containing the polymer is a negative image recording layer containing an infrared absorbent and thermoplastic polymer fine particles.
11. The printing plate precursor according to any one of claims 7 to 10,
wherein the layer containing the polymer is removable by at least any of printing ink and dampening water.
12. The printing plate precursor according to any one of claims 1 to 6,
wherein the layer containing the polymer is a non-photosensitive layer.
13. The printing plate precursor according to claim 12,
wherein the layer containing the polymer is removable by at least any of printing ink and dampening water.
14. A planographic printing plate which is prepared using the printing plate precursor according to any one of claims 1 to 11.
15. A blank plate for printing which is prepared using the printing plate precursor according to claim 12 or 13.

16. A laminate which is formed by bringing a plurality of the printing plate precursors according to any one of claims 1 to 11 into direct contact with each other to laminate the printing plate precursors.
17. A laminate which is formed by bringing a plurality of the printing plate precursors according to claim 12 or 13 into direct contact with each other to laminate the printing plate precursors.
18. A laminate which is formed by bringing a plurality of the planographic printing plates according to claim 14 into direct contact with each other to laminate the planographic printing plates.
19. A laminate which is formed by bringing a plurality of the blank plates for printing according to claim 15 into direct contact with each other to laminate the blank plates for printing.