Lithographic printing plate precursor and plate making method thereof

A lithographic printing plate precursor comprising:

• a support;
• and
• an image-recording layer which comprises a urethane resin synthesized with at least one compound represented by the following formulae (2) and (3), an infrared absorbing agent, a radical polymerizable compound and a radical polymerization initiator and an unexposed area of which is capable of being removed with at least one of dampening water and ink on a printing machine when the lithographic printing plate precursor is exposed:
• wherein, in the formula (2), m represents from 1 to 3, n represents from 2 to 60, 1 represents 1 to 6, R1 each independently represents a hydrogen atom or a methyl group, R2 each independently represents an alkyl group having 12 or less carbon atoms, and A represents a 3-valent to 8-valent organic residue which is made from at least one non-metallic atom and is made by a combination of at least one of the following four groups represented by (4):
• and, in the formula (3), y represents from 1 to 3, z represents from 2 to 60, x represents 1 to 6, R3 each independently represents a hydrogen atom or a methyl group, R4 each independently represents an alkyl group having 12 or less carbon atoms, and B represents a 3-valent to 8-valent organic residue which is made from at least one non-metallic atom and is made by a combination of at least one of the following five groups represented by (5):