Patent ID: 7442492

Claim:
A planographic printing plate precursor comprising a support, and a photosensitive layer and a protective layer, which are formed in this sequence on or above the support, wherein: the photosensitive layer comprises an infrared absorbing agent, a polymerization initiating agent, a polymerizable compound and a binder polymer comprising repeating units as represented by the following Formula (i); and the protective layer comprises an inorganic lamellar compound: wherein, R 1 represents a hydrogen atom or a methyl group; R 2 represents a connecting group having a chain structure and having two or more types of atom selected from the group consisting of a carbon atom, a hydrogen atom, an oxygen atom, a nitrogen atom, and a sulfur atom, and having 2 to 82 atoms in total; A represents an oxygen atom or —NR 3 —, and R 3 represents a hydrogen atom or a monovalent hydrocarbon group having 1 to 10 carbon atoms; and n is an integer of 1 to 5.