To ensure high sensitivity to Ar+ laser or YAG laser light and to improve the adhesiveness of a protective layer to a photopolymerizable layer without deteriorating developability and ink receptivity by forming a protective layer contg. a water-soluble vinyl polymer and a polymer having specified repeating units on a specified photopolymerizable layer.

This negative type photosensitive material has a photopolymerizable layer contg. an addition polymerizable compd. having at least one ethylenic unsatd. double bond, a photopolymn. initiator and a polymer binder and a protective layer contg. a water-soluble vinyl polymer and a polymer having repeating units represented by formula I or II on the photopolymerizable layer. In the formula I, II, each of R1 and R2 is H or alkyl, each of R11 and R12 is H, an aliphatic or arom. group, R11 and R12 may bond to each other to form a 5- or 6-membered N-contg. hetero ring, each of R21 and R22 is H, an aliphatic or arom. group, R21 and R22 may bond to each other to form a 5- or 6-membered N-contg. hetero ring and R23 is alkylene or arylene.