Disclosed are a light sensitive composition containing A) an addition polymerizable
ethylenically double bond-containing monomer, B) a photopolymerization initiator,
and C) a polymer binder, wherein the addition polymerizable ethylenically double
bond-containing monomer is a reaction product of a tertiary amine having two or
more hydroxyl groups in the molecule, a diisocyanate having an aromatic ring in
the molecule and a compound having a hydroxyl group and an addition polymerizable
ethylenically double bond in the molecule, and a light sensitive planographic printing
plate precursor comprising the light sensitive composition.
