PROBLEM TO BE SOLVED: To obtain the subject composition useful, e.g. as a coating for packaging container exteriors, excellent in ultraviolet-curability, and processability, toughness and adhesion after being cured by incorporating an OH-containing ethylene-based unsaturated monomer and bisphenol F type epoxy resin. SOLUTION: This composition comprises (A) a photocationic polymerization initiator, e.g. sulfonium salt, (B) a photocationic polymerizable epoxy-based monomer, e.g. an alicyclic epoxy compound, (C) an organic silicone-based resin, (D) an OH-containing ethylene-based unsaturated monomer, e.g. a compound shown by formula I (R is H or a lower alkyl; Y is a 2-6C alkylene; and (n) >=1), and (E) a bisphenol F type epoxy resin having at least 3,000 epoxy equivalents, e.g. an epoxy resin composed of a repeating unit shown by formula II (Φ is phenylene; and (m) is a number that gives 3,000 to 5,000 epoxy equivalents). The composition preferably contains the components D and E each at 5 to 15wt.%.