A high speed closing switch comprising: a case having an interior which is hermetically closed; a ground electrode installed within the case; a high voltage electrode installed within the case and spaced apart from the ground electrode by a predetermined interval; a movable electrode installed within the case and configured to move from a first position in which the ground electrode and the high voltage electrode are not connected to a second position in which the ground electrode and the high voltage electrode are connected; a coil installed within the case below the movable electrode and configured to generate electromagnetic force to cause the movable electrode to be moved from the first position to the second position; wherein the case comprises: a body part having top and bottom portions which are open; an upper case configured to hermetically close the open top portion of the body part to which the high voltage electrode is coupled; and a lower case configured to hermetically close the open bottom portion of the body part, and the high speed closing switch further comprising a pipe installed in the case, wherein an upper end of the pipe supports the ground electrode and a lower end of the pipe is supported by the lower case, and wherein the pipe electrically connects the ground electrode and the lower case, characterized in that the high speed closing switch further comprises a returning rod having one end fixedly connected to the movable electrode and the other end protruding to outside of the case; and a driving device installed outside of the case, coupled to the returning rod protruding to outside of the case, and configured to drive the returning rod such that the movable electrode is moved from the second position to the first position. a case having an interior which is hermetically closed; a ground electrode installed within the case; a high voltage electrode installed within the case and spaced apart from the ground electrode by a predetermined interval; a movable electrode installed within the case and configured to move from a first position in which the ground electrode and the high voltage electrode are not connected to a second position in which the ground electrode and the high voltage electrode are connected; a coil installed within the case below the movable electrode and configured to generate electromagnetic force to cause the movable electrode to be moved from the first position to the second position; wherein the case comprises: a body part having top and bottom portions which are open; an upper case configured to hermetically close the open top portion of the body part to which the high voltage electrode is coupled; and a lower case configured to hermetically close the open bottom portion of the body part, and the high speed closing switch further comprising a pipe installed in the case, a body part having top and bottom portions which are open; an upper case configured to hermetically close the open top portion of the body part to which the high voltage electrode is coupled; and a lower case configured to hermetically close the open bottom portion of the body part, and the high speed closing switch further comprising a pipe installed in the case, wherein an upper end of the pipe supports the ground electrode and a lower end of the pipe is supported by the lower case, and wherein the pipe electrically connects the ground electrode and the lower case, characterized in that the high speed closing switch further comprises a returning rod having one end fixedly connected to the movable electrode and the other end protruding to outside of the case; and a driving device installed outside of the case, coupled to the returning rod protruding to outside of the case, and configured to drive the returning rod such that the movable electrode is moved from the second position to the first position.