Vehicle door structure

A vehicle door structure comprising:

• a horizontal beam arranged inside a door of a vehicle to extend in a vehicle front-rear direction;
• and
• a vertical beam arranged inside the door to extend in a vehicle up-down direction, wherein
• a vehicle front-side end and a vehicle rear-side end of the horizontal beam are each fixed to a door frame,
• the vertical beam includes an upper vertical beam extending upward from the horizontal beam and a lower vertical beam extending downward from the horizontal beam,
• the upper vertical beam and the lower vertical beam each are fixed in a cantilever fashion to an intermediate portion of the horizontal beam in an axial direction thereof,
• the upper vertical beam and the lower vertical beam each includes a beam body portion and a coupling portion provided at an end of the beam body portion,
• the coupling portion forms an L-cross sectional shape, and includes a flat plate portion and a bent portion integrally formed with the flat plate portion and bent in the vehicle up-down direction substantially perpendicularly from the outer end of the flat plate portion in the vehicle width direction,
• a dimension of the flat plate portion in the vehicle front-rear direction is larger than a dimension of the end of the beam body portion in the vehicle front-rear direction,
• the flat plate portion is joined to an upper face and a lower face of the horizontal beam, respectively, and
• the bent portion is joined to an outer side face of the horizontal beam in the vehicle width direction.