A photosensitive lithographic printing plate comprising a hydrophilic
support and a photopolymerizable photosensitive layer containing: (i) a
sensitizing dye having an absorption maximum in a wavelength range of
from 360 to 450 nm; (ii) a hexaarylbisimidazole compound; (iii) an
addition polymerizable compound having an ethylenically unsaturated
double bond; (iv) a binder polymer; and (v) a mercapto compound
represented by the following formula (1) as defined herein.