To provide a reactive vinyl block copolymer and a star-like reactive vinyl block copolymer having a functional end group and wide range applications such as an adhesive, sealing agent, elastic adhesive, paint, cellular material, film, thermoplastic elastomer, damping material, various moldings, compatibilizer and resin modifier or the like, and to provide a curable resin composition containing the same.

The reactive vinyl block copolymer has a functional group at the end of the vinyl block copolymer shown by P1-...Pn-1-Pn, in the formula, n shows two or more integers, P1,...Pn-1 or Pn shows each the block consisting of a vinyl polymer, N blocks shown by the P1,...Pn-1 or Pn are the reactive vinyl block copolymer having the block whose Tg is 20°C or less and the block whose Tg higher 20°C or more than the block, for at least a set.