Door for a vehicle

The outer panel 2 includes: a lower frame 16 arranged in a lower portion of the door body 1, extending in the longitudinal direction of the vehicle; an outside plate 2a forming a surface of the vehicle body outside the lower frame 16; and an inside plate 2b folded back at a lower end portion of the outside plate 2a, extending to the inside of the vehicle of the lower frame 16. When the lower frame 16 and the outer panel 2 are joined to each other, a closed cross section is formed in the lower portion of the door body 1.