A vehicle trunk door structure comprising: a trunk door structured with an outer panel and an inner panel, the trunk door including an upper wall portion (24, 30) that extends in a vehicle front-and-rear direction and a rear wall portion (26, 32) that extends in a vehicle downward direction from the vehicle front-and-rear direction rear end of the upper wall portion (24, 30), and the trunk door being provided to be capable of opening and closing an opening of a luggage compartment of the vehicle, due to the vehicle forward side of the upper wall portion (24, 30) being supported at a vehicle main body via a hinge; an urging member connected to each of two vehicle width direction sides of the vehicle forward side of the trunk door, the urging member urging the trunk door in an opening direction; a locking mechanism (42, 47) that anchors a vehicle width direction middle portion of a vehicle rearward lower edge of the trunk door at the vehicle body; a ring bead that is formed at the inner panel and forms a circuit round an outer periphery of the inner panel; and a longitudinal bead that is formed at the inner panel and extends in the vehicle front-and-rear direction at a vehicle width direction middle portion, each of two end portions of the longitudinal bead connecting to the ring bead; characterized by further comprising a lateral bead that is provided along a ridgeline region between the upper wall portion (24, 30) and the rear wall portion (26, 32), the lateral bead extending from the longitudinal bead toward each vehicle width direction outer side, and each vehicle width direction outer side end portion of the lateral bead being disposed at a position that is separated from the ring bead. a trunk door structured with an outer panel and an inner panel, the trunk door including an upper wall portion (24, 30) that extends in a vehicle front-and-rear direction and a rear wall portion (26, 32) that extends in a vehicle downward direction from the vehicle front-and-rear direction rear end of the upper wall portion (24, 30), and the trunk door being provided to be capable of opening and closing an opening of a luggage compartment of the vehicle, due to the vehicle forward side of the upper wall portion (24, 30) being supported at a vehicle main body via a hinge; an urging member connected to each of two vehicle width direction sides of the vehicle forward side of the trunk door, the urging member urging the trunk door in an opening direction; a locking mechanism (42, 47) that anchors a vehicle width direction middle portion of a vehicle rearward lower edge of the trunk door at the vehicle body; a ring bead that is formed at the inner panel and forms a circuit round an outer periphery of the inner panel; and a longitudinal bead that is formed at the inner panel and extends in the vehicle front-and-rear direction at a vehicle width direction middle portion, each of two end portions of the longitudinal bead connecting to the ring bead; characterized by further comprising a lateral bead that is provided along a ridgeline region between the upper wall portion (24, 30) and the rear wall portion (26, 32), the lateral bead extending from the longitudinal bead toward each vehicle width direction outer side, and each vehicle width direction outer side end portion of the lateral bead being disposed at a position that is separated from the ring bead.