PURPOSE: A door closure is provided to keep the opening and locking states of a door with simple structure and to prevent the sudden operation of a door. CONSTITUTION: The door closure contains: a fixture(1) fixed to a doorframe and provided with a fixing gear(3); a frame member(2) installed to a door and connected to the fixture(1) to move together; a support shaft(10) connected to the frame member(2) to connect the frame member(2) with the fixture(1) to be movable together and provided with a door closing spring(15) to add spring force toward the door closing direction; a movable shaft(17) installed to the frame member(2) to be moved together with a movable gear(18) coupled with the fixing gear(3) and provided with a compression spring(22) to restrain the movement of the movable shaft(17); a reciprocating plate(20) fastened on a screw unit of the movable shaft(17) to change the compressive force of the compression spring(22); a preventer preventing the sudden operation of a door by preventing the movement of the movable shaft(17) when opening and closing a door suddenly; and a door locking unit preventing the movement of the movable shaft(17) when a door is located on the appointed site.
