To obtain an adhesive resin composition excellent in adhesion of polyolefin-based resin sheet.

This adhesive resin composition is obtained by adding 0.5-20 wt.% organic diisocyanate compound to an acid-modified chlorinated polyolefin resin having 15-25 wt.% chlorine content, 1-10 wt.% grafted amount of α,β-unsaturated carboxylic acid or an anhydride thereof, and 40,000-100,000 weight average molecular weight.