In a vehicle with a tailgate, a rear opening is formed in a rear surface of a vehicle body, a tailgate that is provided to open and close the rear opening, a sub-door opening that is formed in a portion of the tailgate in a width direction, and a sub-door that is provided to open and close the sub-door opening. The vehicle includes a tailgate latch device that locks the tailgate with the vehicle body, a sub-door latch device that locks the sub-door with the vehicle body, and a control unit that controls the tailgate latch device and the sub-door latch device. The control unit controls the sub-door latch device so as to prohibit the sub-door from being opened when determining that the tailgate is opened.