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A photopolymerizable composition which comprises (a) a polymerizable compound having at least one ethylenic unsaturated bond, and (b) a salt formed by an organic cationic dye compound and an organic boron compound anion, wherein the salt is represented by the following formula (I), in which an organ

A photopolymerizable composition which comprises (a) a polymerizable compound having at least one ethylenic unsaturated bond, and (b) a salt formed by an organic cationic dye compound and an organic boron compound anion, wherein the salt is represented by the following formula (I), in which an organic cationic dye compound is employed as D�to impart high spectral sensitivities to the composition [Figure] (I) wherein D�represents a cationic dye, and R1, R2, R3 and R4, which may be the same or different, each represents an alkyl group, an aryl group, an aralkyl group, an alkaryl group, an alkenyl group, an alkynyl group, or a group derived therefrom; and two or more of the substituent groups R1 and R4 can be combined to form a cyclic structure. The cationic dye D�is represented by formula (II) f�-L=YfYfY

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A photopolymerizable composition which consists essentially of (a) a polymerizable compound having at least one ethylenic unsaturated bond, and (b) a salt formed by an organic cationic dye compound and an organic boron compound anion, wherein the salt is represented by the following formula (I), wit

A photopolymerizable composition which consists essentially of (a) a polymerizable compound having at least one ethylenic unsaturated bond, and (b) a salt formed by an organic cationic dye compound and an organic boron compound anion, wherein the salt is represented by the following formula (I), with the organic cationic dye compound (D�) being represented by the following formula (II): [Figure] (I) wherein D�represents a cationic dye; and R1, R2, R3 and R4, which may be the same or different, each represents an alkyl group, an aryl group, an aralkyl group, an alkaryl group, an alkenyl group, an alkynyl group, an alicyclic group, a heterocyclic group, an allyl group, or a group derived therefrom, and two or more of the substituent groups R1 to R4 can combine to form a cyclic structure, fL=YfYfYfYffffffffffffffffff11 or R15 in the heterocyclic ring of formula ff11 or R15 combines with L to form a ring, it corresponds to a divalent linking group represented by Z, wherein Z is a divalent linking group for completing a ring by combining with fY12 or R13 is a unsubstituted or substituted alkyl group or unsubstituted or substituted aryl group, R14 is an alkyl group, an aryl group, a heterocyclic ring residual group, a halogen atom, an alkoxy group, an aryloxy group, an alkylthio group, an arylthio group, an alkylcarbonyl group, an arylcarbonyl group, an alkyloxycarbonyl group, an aryloxycarbonyl group, an alkylcarbonyloxy group, an arylcarbonyloxy group, an alkylamido group, an arylamido group, an alkylcarbamoyl group, an arylamino group, an alkylsulfonyl group, an arylsulfonyl group, an alkylsulfonamido group, an arylsulfonamido group, an alkylsulfamoyl group, an arylsulfamoyl group, a cyano group or a nitro group, and p is an integer of 0 to 4, and when p is 2 or more, plural R14\s may be the same or different from each other.