Patent ID: 8418408

Claim:
A vehicle door structure comprising an outer panel disposed on an outboard side and an inner panel disposed on an inboard side, wherein: the inner panel is provided with a major plane extending both vertically and in a fore-and-aft direction, and a beam member extending in a fore-and-aft direction is attached to the inner panel, the beam member having a cross section whose centroid substantially coincides with the major plane; and wherein the cross section of the beam member comprises an S-shaped cross section part formed by a pair of channel members each having a rectangular C-shaped cross section, the two channel members being connected one above the other in a mutually laterally reversed configuration such that a plurality of ridge lines extending in the fore-and-aft direction are defined, and an access opening is formed in a vertically extending planar part of the beam member which is vertically more elongated than another, substantially coplanar part of the beam member adjacent thereto along the fore-and-aft direction, wherein the access opening is confined within the vertically extending planar part of the beam member.