To provide an adhesive resin having excellent adhesion to a hardly adhering base material with the use of a simple device by an easy method and a composition containing the resin.

The adherent resin composition comprises (1) 100 pts.wt. modified polyolefin resin composition which is obtained by melt kneading a polyolefin resin (a) with an epoxy group-containing vinyl monomer (c) and an aromatic vinyl monomer (d) as essential components and other vinyl monomers (e) as optional components in the presence of a radical polymerization initiator (b) and has a ratio of the epoxy group-containing monomer (c) in 100 wt.% sum of the polyolefin resin (a), the epoxy group-containing monomer (c), the aromatic vinyl monomer (d), and the other vinyl monomers (e) in the range of 0.1-50 wt.% and (2) 0.5-500 pts.wt. olefin copolymer rubber.