A robot system, comprising: a robot main body being a slave arm; a memory part configured to store information for causing the slave arm to perform a given operation, as saved operational information; a motion controller configured to control the operation of the slave arm by using the saved operational information as automatic operational information for causing the slave arm to operate; and an operation correcting device being a master arm installed outside a workspace of the slave arm and configured to be manipulated by an operator to generate manipulating information for correcting the operation of the slave arm during operation, wherein the motion controller is configured to control the slave arm to perform an operation corrected from the operation related to the automatic operational information in response to a reception of the manipulating information while the slave arm is operating by using the automatic operational information, wherein when the manipulating information is not sent to the motion controller, the motion controller is configured to control the operation of the slave arm by using only the automatic operational information; and when the manipulating information is received while the slave arm is operating automatically using the automatic operational information, the motion controller is configured to control the operation of the slave arm by using both the automatic operational information and the manipulating information; wherein the memory part is configured to store corrected operational information for causing the slave arm to perform the corrected operation as the saved operational information, when the slave arm performs the corrected operation, and wherein the robot system is configured to allow the operator to manipulate the master arm while the slave arm is operating automatically using the automatic operational information. a robot main body being a slave arm; a memory part configured to store information for causing the slave arm to perform a given operation, as saved operational information; a motion controller configured to control the operation of the slave arm by using the saved operational information as automatic operational information for causing the slave arm to operate; and an operation correcting device being a master arm installed outside a workspace of the slave arm and configured to be manipulated by an operator to generate manipulating information for correcting the operation of the slave arm during operation, wherein the motion controller is configured to control the slave arm to perform an operation corrected from the operation related to the automatic operational information in response to a reception of the manipulating information while the slave arm is operating by using the automatic operational information, wherein when the manipulating information is not sent to the motion controller, the motion controller is configured to control the operation of the slave arm by using only the automatic operational information; and when the manipulating information is received while the slave arm is operating automatically using the automatic operational information, the motion controller is configured to control the operation of the slave arm by using both the automatic operational information and the manipulating information; wherein when the manipulating information is not sent to the motion controller, the motion controller is configured to control the operation of the slave arm by using only the automatic operational information; and when the manipulating information is received while the slave arm is operating automatically using the automatic operational information, the motion controller is configured to control the operation of the slave arm by using both the automatic operational information and the manipulating information; wherein the memory part is configured to store corrected operational information for causing the slave arm to perform the corrected operation as the saved operational information, when the slave arm performs the corrected operation, and wherein the robot system is configured to allow the operator to manipulate the master arm while the slave arm is operating automatically using the automatic operational information.