PURPOSE: To provide a photosensitive compsn. for a photosensitive pianographic printing plate having excellent sensitivity.
CONSTITUTION: In this photosensitive compsn. contg. a compd. capable of producing an acid under irradiation with active rays of light and a compd. having a bond which can be decomposed by the acid, the compd. capable of producing an acid under irradiation with active rays of light is a 2- halomethyl-1,3,4-oxadiazole compd. having at least an optionally substd. naphthofuryl group at the 5-position in a directly bonded state or through a vinyl group.