A working machine control device that is adapted to remotely control a working machine including a lower travelling body and an upper slewing body that slews with respect to the lower travelling body , the working machine control device comprising: a display unit that is provided outside the working machine; a camera that is adapted to be disposed on the upper slewing body and to obtain a captured image by imaging a particular part (S) that is a part of the lower travelling body ; and a controller that is provided outside the working machine, wherein the controller includes: a setting unit that sets a target slewing angle of the upper slewing body with respect to the lower travelling body ; and a display control unit that causes the display unit to display a display screen in which a target image indicating a target position of the particular part (S) is displayed in a superimposed manner at a position on the captured image , the position being where the particular part (S) is displayed when a slewing angle (θ) of the upper slewing body with respect to the lower travelling body reaches the target slewing angle, characterized in that the controller is adapted such that as a display position of the particular part (S) corresponding to the target slewing angle, a position on the captured image calculated in advance in consideration of the position of the camera in the upper slewing body , the size of the upper slewing body , and the size of the lower travelling body is employed. a display unit that is provided outside the working machine; a camera that is adapted to be disposed on the upper slewing body and to obtain a captured image by imaging a particular part (S) that is a part of the lower travelling body ; and a controller that is provided outside the working machine, wherein the controller includes: a setting unit that sets a target slewing angle of the upper slewing body with respect to the lower travelling body ; and a display control unit that causes the display unit to display a display screen in which a target image indicating a target position of the particular part (S) is displayed in a superimposed manner at a position on the captured image , the position being where the particular part (S) is displayed when a slewing angle (θ) of the upper slewing body with respect to the lower travelling body reaches the target slewing angle, characterized in that the controller is adapted such that as a display position of the particular part (S) corresponding to the target slewing angle, a position on the captured image calculated in advance in consideration of the position of the camera in the upper slewing body , the size of the upper slewing body , and the size of the lower travelling body is employed. a setting unit that sets a target slewing angle of the upper slewing body with respect to the lower travelling body ; and a display control unit that causes the display unit to display a display screen in which a target image indicating a target position of the particular part (S) is displayed in a superimposed manner at a position on the captured image , the position being where the particular part (S) is displayed when a slewing angle (θ) of the upper slewing body with respect to the lower travelling body reaches the target slewing angle, characterized in that the controller is adapted such that as a display position of the particular part (S) corresponding to the target slewing angle, a position on the captured image calculated in advance in consideration of the position of the camera in the upper slewing body , the size of the upper slewing body , and the size of the lower travelling body is employed. <EOS>