PURPOSE: To eliminate the need for the reduction of oil in quantity corresponding to the expansion section of oil, and to operate a door closure normally by mounting a flexible bag into a door closure body and absorbing the expansion section of oil due to heating at the time of baking coating by the deformation of the bag.

CONSTITUTION: The inside of a main body 1 is filled with oil while a flexible bag 5 consisting of oil-resistant and heat-resistant resin material is placed into a coil spring 4, thus absorbing the expansion section of oil by deformation. A gear 2 is borne to a shaft 6 projected to the upper end of the main body 1, and the upper-end projecting section of the shaft 6 is connected to the upper frame of the doorway of a building through a two-throw arm, etc. A ball valve 8 is installed into the spout 7 of oil, and pushed by oil only when a piston 3 is moved against the force of the coil spring 4, when a door is opened, and the spout 7 is opened. Speed at the time of the closing of the door is inhibited by reducing a flow rate by a flow control shaft 9. When the external surface of the door closure body 1 is baking-finished, oil in the main body 1 is expanded by heating, and the expansion section is absorbed by the deformation of the bag 5.