A dye represented by formula (1): D--(A--Yn1)n2 ( 1) wherein D is a phthalocyanine nucleus, A is a connecting group, Y is a photopolymerizable group represented by any one of formulae (2) or (5) to (7) ##STR207## wherein R1 represents a substituted or unsubstituted alkyl group, a substituted or unsubstituted cycloalkyl group, a substituted or unsubstituted aralky