A flame-resistant, photo-curing resin composition of the present invention consists of:(a) 35 to 65 parts by weight of an acrylic thermoplastic polymer, the acrylic thermoplastic polymer being 15 to 30% by weight copolymerized with at least one of monomer containing an alpha, beta-unsaturated carboxyl group,(b) 5 to 30 parts by weight of a bromine-substituted monomer represented by a general formula [I]: ##STR1## wherein R.sub.1 is H or CH.sub.3,A is ##STR2## wherein R.sub.2 is an alkylene group containing two or three carbon atoms,n is an integer between 1 and 4, andX.sub.1, X.sub.2, and X.sub.3 are Br or H, under a condition that at least two of the X.sub.1, X.sub.2, and X.sub.3 are Br,(c) 0 to 10 parts by weight of antimony trioxide particles with an average diameter of 0.1 .mu.m or smaller,(d) 20 to 50 parts by weight of a vinyl monomer, excluding component (b), and(e) 0.01 to 10 parts by weight of a photo-polymerizing initiator, wherein a total amount of the component (a), (b), (c), (d), and(e) is 100 parts by weight.