Polyfunctional vinyl aromatic copolymer and method for manufacturing same, copolymer rubber obtained therefrom, rubber composition, rubber crosslinked material, and tire member

3-4. (canceled)

A conjugated diene copolymer composition, comprising 0.5 to 200 parts by weight of at least one reinforcing filling agent selected from the group consisting of silica inorganic filling agents, metal oxides, metal hydroxides and carbon black with respect to 100 parts by weight of the conjugated diene copolymer according to claim 12.

9-11. (canceled)

A polyfunctional vinyl aromatic copolymer, comprising 0.5 mol % or more and 40 mol % or less of a structural unit (a) derived from a divinyl aromatic compound and 60 mol % or more and 99.5 mol % or less of a structural unit (b) derived from a monovinyl aromatic compound, in which at least some of the structural units (a) are a crosslinked structural unit (a2) represented by the following Formula (2) and a vinyl-group-containing structural unit (a1) represented by the following Formula (1):

• in the formula, R1's independently represents an aromatic hydrocarbon group having 6 to 30 carbon atoms,
• wherein the molar fraction of the crosslinked structural unit (a2) with respect to the structural unit (a) is within a range of 0.05 to 0.50, the molar fraction of the vinyl-group-containing structural unit (a1) with respect to the total amount of the structural units (a) and (b) is within a range of 0.001 to 0.35, the number average molecular weight Mn of the polyfunctional vinyl aromatic copolymer is 1,000 to 50,000, and the molecular weight distribution (Mw/Mn) represented by the ratio of the weight average molecular weight Mw to the number average molecular weight Mn is 8.0 or less.

16-22. (canceled)

27-33. (canceled)