A lithographic printing plate precursor comprising: a support; and an image-recording layer comprising a polymerization initiator, a sensitizing dye and a polymerizable compound, wherein the image-recording layer or an undercoat layer which is optionally provided between the support and the image-recording layer comprises a polymer compound comprising a repeating unit having a side chain having a structure represented by the following formula (a1-1) and a repeating unit having a side chain having at least one structure of the following formulae (a2-1), (a2-2), (a2-3), (a2-4), (a2-5) and (a2-6): wherein R 11 represents a hydrogen atom, an alkyl group, an aryl group, a heterocyclic group, a sulfo group, an alkylsulfonyl group, a arylsulfonyl group, an acyl group, an aryloxycarbonyl group, an alkoxycarbonyl group or a carbamoyl group, R 12, R 13 and R 14 each independently represents a hydrogen atom, an alkyl group or an aryl group, L 1 represents a connecting group, Y 1 represents a single bond or a divalent connecting group selected from the group consisting of -CO-, -O-, -HN-, a divalent aliphatic group, a divalent aromatic group and a combination of these groups, and * indicates a site connecting to a main chain of the polymer compound; wherein M 21 and M 22 each independently represents a hydrogen atom, a metal atom belonging to alkali metal or alkaline earth metal or an ammonium, R 21 to R 23 each independently represents a hydrogen atom or an alkyl group, Y 2 represents a single bond or a divalent connecting group selected from the group consisting of -CO-, -O-, -HN-, a divalent aliphatic group, a divalent aromatic group and a combination of these groups, and * indicates a site connecting to a main chain of the polymer compound. a support; and an image-recording layer comprising a polymerization initiator, a sensitizing dye and a polymerizable compound, wherein the image-recording layer or an undercoat layer which is optionally provided between the support and the image-recording layer comprises a polymer compound comprising a repeating unit having a side chain having a structure represented by the following formula (a1-1) and a repeating unit having a side chain having at least one structure of the following formulae (a2-1), (a2-2), (a2-3), (a2-4), (a2-5) and (a2-6): wherein R 11 represents a hydrogen atom, an alkyl group, an aryl group, a heterocyclic group, a sulfo group, an alkylsulfonyl group, a arylsulfonyl group, an acyl group, an aryloxycarbonyl group, an alkoxycarbonyl group or a carbamoyl group, R 12, R 13 and R 14 each independently represents a hydrogen atom, an alkyl group or an aryl group, L 1 represents a connecting group, Y 1 represents a single bond or a divalent connecting group selected from the group consisting of -CO-, -O-, -HN-, a divalent aliphatic group, a divalent aromatic group and a combination of these groups, and * indicates a site connecting to a main chain of the polymer compound; wherein M 21 and M 22 each independently represents a hydrogen atom, a metal atom belonging to alkali metal or alkaline earth metal or an ammonium, R 21 to R 23 each independently represents a hydrogen atom or an alkyl group, Y 2 represents a single bond or a divalent connecting group selected from the group consisting of -CO-, -O-, -HN-, a divalent aliphatic group, a divalent aromatic group and a combination of these groups, and * indicates a site connecting to a main chain of the polymer compound.