A vehicle door structure 1 includes a lock mechanism 40. The lock mechanism 40 includes a portion to be locked 50 provided to a guided body 18, a first locking portion 60 arranged at a position that corresponds to the portion to be locked 50 when the slide door 6 is in the fully closed position, and a second locking portion 70 arranged at a position that corresponds to the portion to be locked 50 when the slide door 6 is in the fully open position. The portion to be locked 50, in the fully closed position or the fully open position, protrudes toward the first locking portion 60 or the second locking portion 70 and is locked by the first locking portion 60 or the second locking portion 70. The second locking portion 70 protrudes toward the portion to be locked 50 when the swing door 70 is opened.