To solve the problem that a rotary door provided with an easy closer of a vehicle or the like might hurt a finger due to excessive weight in overstroke if the finger of an operator or passenger is pinched between the lower end of the door and the upper surface of a bumper by mistake when overstroke as final operation for securely locking is automatically performed.

The lower end 30 of the rotary door faces to the bumper structure of the vehicle when the rotary door 3 provided with the easy closer is closed. The problem is solved by the bumper structure of the rotary door which includes a bumper mounting bracket 4 on which the bumper 2 is mounted, and the easy closer provided with a cushion material 1 between the lower surface of the bumper 2. Deformation load of the cushion material 1 is in a range from the load of the bumper 2's own weight and the load hurting the finger f pinched between the lower end 30 of the rotary door 3 and the bumper 2.