A vehicle door panel, which can prevent a slide-openable door panel from deviating from a swing-openable door panel when the swing-openable door panel is opened, is provided. The vehicle door structure 10 includes a slide door panel 14, a swing door panel 16, a slide mechanism 18 and a hinge mechanism 20, and includes a lock mechanism 22 for locking the slide door panel 14 to the swing door panel 16 when the swing door panel 16 is opened. The lock mechanism 22 is configured by a locking portion 50 installed in the swing door panel 16 and protruding toward the slide door panel 16 when the swing door panel 16 is opened, and an opening portion 60 installed in the slide door panel 14 and locked by the locking portion 50 when the swing door panel 16 is opened.