Provide is a method for closing a hole in an object with a film. The method comprises: attaching the object to an electric discharge machine as a workpiece; making an electrode approach the object so as to be overlapped with the hole, the electrode being formed of a powder including a conductive material; repeatedly applying a voltage by using the electric discharge machine between the electrode and the object so that discharging occurs therebetween and thereby growing a film for closing the hole from the periphery of the hole; and performing a mechanical process for sloping the edge of the hole before a step for applying the voltage or sloping the film along the edge of the hole during the step for applying the voltage.
