PURPOSE: To provide the resin composition excellent in impact resistance, delamination resistance and fluidity and useful for moldings, etc., by blending a vinyl chloride based resin, etc., with an olefin-based resin and a specific compatibilizer in a specific ratio.

CONSTITUTION: The resin composition is obtained by blending 100 pts. wt. total amount of (A) 1-99 pts.wt. vinyl chloride-based resin and/or styrene-based resin and (B) 99-1 pts.wt. olefin-based resin such as PP with (C) 0.1-50 pts. wt. compatibilizer consisting of (i) 5-95 pts.wt. modified olefin-based polymer containing 0.05-50wt.% compound having a reactive group such as carboxyl group and (ii) 95-5 pts.wt. modified vinyl chloride-based polymer containing 0.05-50wt.% compound having a reactive group capable of reacting with the component (i), e.g. epoxy group, amino group or hydroxyl group.