A manipulator system configured to perform a work on a workpiece being moved by a moving device (30; 30A), comprising: a robotic arm, having one or more joints (11 to 14) and to which a tool configured to perform the work to the workpiece is attached; an operating device including a manipulandum configured for being operated by a worker and a processor configured to generate an operating instruction of the robotic arm according to operation data of the manipulandum; a first imaging means configured to image the workpiece, while following the movement of the workpiece; a second imaging means fixedly provided in a work area to image a situation of the work to the workpiece; and a displaying means configured to display an image imaged by the first imaging means and an image imaged by the second imaging means; a control device configured to control the operation of the robotic arm based on the operating instruction and on an automatic operation program, while detecting a moving amount of the workpiece being moved by the moving device (30; 30A) and while carrying out a tracking control of the robotic arm according to the detected moving amount of the workpiece, wherein the manipulator system is configured to perform the work to the workpiece being moved by a conveyor or a positioner provided with one or more driving shafts, wherein the control device is configured to detect the moving amount of the workpiece based on a driving amount of the driving shaft of the conveyor or the positioner, wherein the control device is configured to set target values of position and posture of a tip end of the robotic arm based on the automatic operation program, wherein the control device is configured to calculate first moving amounts of the position and posture of the tip end of the robotic arm based on the moving amount of the workpiece, wherein the control device is configured to calculate second moving amounts of the position and posture of the tip end of the robotic arm based on the operating instruction, and wherein the control device is configured to control the operation of the robotic arm based on a value obtained by adding the first moving amounts and the second moving amounts to the target values. a robotic arm, having one or more joints (11 to 14) and to which a tool configured to perform the work to the workpiece is attached; an operating device including a manipulandum configured for being operated by a worker and a processor configured to generate an operating instruction of the robotic arm according to operation data of the manipulandum; a first imaging means configured to image the workpiece, while following the movement of the workpiece; a second imaging means fixedly provided in a work area to image a situation of the work to the workpiece; and a displaying means configured to display an image imaged by the first imaging means and an image imaged by the second imaging means; a control device configured to control the operation of the robotic arm based on the operating instruction and on an automatic operation program, while detecting a moving amount of the workpiece being moved by the moving device (30; 30A) and while carrying out a tracking control of the robotic arm according to the detected moving amount of the workpiece, wherein the manipulator system is configured to perform the work to the workpiece being moved by a conveyor or a positioner provided with one or more driving shafts, wherein the control device is configured to detect the moving amount of the workpiece based on a driving amount of the driving shaft of the conveyor or the positioner, wherein the control device is configured to set target values of position and posture of a tip end of the robotic arm based on the automatic operation program, wherein the control device is configured to calculate first moving amounts of the position and posture of the tip end of the robotic arm based on the moving amount of the workpiece, wherein the control device is configured to calculate second moving amounts of the position and posture of the tip end of the robotic arm based on the operating instruction, and wherein the control device is configured to control the operation of the robotic arm based on a value obtained by adding the first moving amounts and the second moving amounts to the target values.