The present invention relates to a limit switch and, more specifically, to a limit switch using a proximity sensor. The limit switch of the present invention comprises a proximity sensor installed adjacent to a radius of rotation of a rotating touch bar to detect the touch bar; a case storing and fixing the proximity sensor while adjusting the fixed position of the proximity sensor; a terminal platform located inside the case for connection with a cable of the proximity sensor; and an alarm member indicating the operation of the proximity sensor connected to the terminal platform.
