The present invention provides a polymerizable composition comprising (A) a compound represented by the following formula (I), (B) an infrared absorbent, and (C) a compound having at least one addition-polymerizable ethylenically unsaturated bond, and a negative planographic printing plate precursor having a recording layer containing the polymerizable composition. In the formula (I), R 1 , R 2 , R 3 , R 4 , R 5 , and R 5 each independently represent a hydrogen atom or a monovalent organic group; and X - represents an anion.
Polymerizable composition and planographic printing plate precursor