To provide a door having a device for preventing an accident of being injured by pinching fingers or nipping the body in a motor-driven rotary door, in the door strongly pressed to a door stop without causing impact without accelerating when closed.

The door continuously rotates up to closing when closed a little by fully opening when opened a little, for preventing the accident by keeping a rotatable state in the opening direction for a little time just before closing, by stopping once by rotating in the opening direction before closing, by reducing a speed by contracting over time without contracting a spring instantly.