Vehicle door structure

A vehicle door structure comprising an outer panel disposed on an outboard side of the door structure, an inner panel disposed on an inboard side of the door structure and a hinge allowing the door structure to be opened and closed with respect to the vehicle body, an upper part of the door structure defining a door window opening, the door structure further comprising:

• a beam member attached to an upper part of the inner panel so as to extend in a fore-and-aft direction, and including a pair of channel sections each having a C-shaped cross section with a convex side thereof facing sideways and vertically joined to each other in a mutually reversed relationship so as to define an S-shaped cross section;
• wherein the pair of channel sections include an upper channel section and a lower channel section,
• wherein the upper channel section has an upper edge adjoining and extending in parallel with a lower edge of the window opening, and has a bottom wall which is vertically enlarged in a front part of the door structure;
• wherein the lower channel section extends substantially in parallel with the lower edge of the window opening in a rear end portion thereof and is offset to a lower part of the door structure in a front part thereof, a front end of the lower channel section being located at an elevation overlapping with the hinge;
• and
• wherein an engagement portion is provided in a front end of the door structure at a part aligning with the beam member, and a corresponding engagement portion is provided in a front pillar opposing the front end of the door structure so as to restrict an outboard displacement of the door structure at a time of a frontal crash by cooperating with the engagement portion of the door structure, the corresponding engagement portion of the front pillar being aligned with the front end of the beam member.