Door structure for vehicle

One large opening (1) formed in a car body side portion and continuous in a back-and-forth direction is opened and closed by front and rear side doors (11, 12). When the side doors (11, 12) are closed, a lap portion (15) is formedwhere a rear end of the front side door (11) overlaps a front end of the rear side door (12) externally in a direction of car width. A reinforcing member (25) extending in a vertical direction is disposed on the rear side door (12) in the vicinity of the lap portion (15). The rear end of a front impact bar (27) disposed in the front side door (11) extends to the lap portion (15). The front end of a rear impact bar (26) disposed in the rear side door (12) is connected to the reinforcing member (25).