To provide a relief printing plate precursor for laser engraving excellent in rinse of engraved scrap, engraving sensitivity, and tack properties of a film surface, and a process for producing the same, and to further provide a resin composition for laser engraving suitably used for the printing plate precursor, a relief printing plate excellent in ink transfer, and a process for making the relief printing plate.

There is disclosed a resin composition for laser engraving, comprising (Component A) a polyurethane having an ethylenically unsaturated group and having a number-average molecular weight of at least 5,000, (Component B) a compound having at least two isocyanate groups in the molecule, (Component C) a compound having at least two active hydrogens in the molecule, and (Component D) a thermopolymerization initiator.