SIDE SILL ASSEMBLY FOR ECO-FRIENDLY VEHICLE

A side sill assembly for an eco-friendly vehicle includes: a center member fastened to a side surface of a center floor panel of the eco-friendly vehicle; a front outer member fastened to a front end of the center member; and a front inner member located inside the front outer member and fastened to a front apron and a dash panel. In particular, a battery frame fastened to a side surface of a high voltage battery is fastened to at least one of the front inner member and the center member in a longitudinal direction of the vehicle.