Disclosed is a center pillar assembly of a motor vehicle. The center pillar assembly comprises an outer panel extending from a lower surface of a flange portion of a roof panel toward a floor, the outer panel having an upper end portion which projects outward and upward to form a portion of a side frame arranged along a side of the roof panel; a reinforcing panel extending from a lower surface of an upper flange portion of the outer panel toward the floor such that the reinforcing panel is separated from the outer panel, the reinforcing panel having a stepped portion which is bent toward the upper end portion of the outer panel to define a step-shaped configuration; an inner panel extending from a surface of a roof rail member which is opposed to an upper portion of the side frame, toward the floor, the inner panel cooperating with the outer panel to define a closed space therebetween, the roof rail member having a flange portion on which the roof rail member is joined to an upper end of the side frame; and an upper reinforcing member extending from the upper flange portion of the reinforcing panel along an inner surface of the reinforcing panel, the upper reinforcing member cooperating with the stepped portion of the reinforcing panel to form a closed cross-section.
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