There are provided a center pillar, a roof side rail connected to an upper end portion of the center pillar and having a closed cross section extending in a vehicle longitudinal direction, and a synthetic resin-made reinforcing member provided inside the roof side rail at a position near an upper end portion of the center pillar. The roof side rail comprises a roof rail inner having a protrusion portion and a roof rail outer forming the closed cross section together with the roof rail inner. The reinforcing member is provided to have a gap from the roof rail outer and integrally joined to an outward face, in a vehicle width direction, of the roof rail inner which is roughened by an anchor effect.