An electric working machine , comprising: a motor , a trigger switch , an electric-power supply unit configured to supply electric power to the motor , a control unit configured to perform a motor control process for controlling status of the electric power supply from the electric-power supply unit to the motor , a signal processing unit configured to perform a signal control process for sending and receiving a signal to and from the signal processing unit and an external device, and to receive at least a stop-command signal (Sb) from the external device, wherein the control unit is configured to stop the electric power supply to the motor in a case where the stop-command signal (Sb) is received at the signal processing unit when the electric power supply from the electric-power supply unit to the motor is in process, the control unit is configured to, once the signal processing unit receives the stop-command signal (Sb) and the control unit thereby stops the electric power supply to the motor , maintain a stop-state of power supply to the motor until the signal processing unit receives a permission command signal (Sa) from the external device, and the control unit is configured to, once the signal processing unit receives the stop-command signal (Sb) and the control unit thereby stops the electric power supply to the motor , and subsequently the signal processing unit receives the permission command signal (Sa) from the external device, perform the electric power supply from the electric-power supply unit to the motor under a condition, in which the control unit determines that the trigger switch is in an off-state and the control unit subsequently determines that the trigger switch is in an on-state and the motor is not being driven. a motor , a trigger switch , an electric-power supply unit configured to supply electric power to the motor , a control unit configured to perform a motor control process for controlling status of the electric power supply from the electric-power supply unit to the motor , a signal processing unit configured to perform a signal control process for sending and receiving a signal to and from the signal processing unit and an external device, and to receive at least a stop-command signal (Sb) from the external device, wherein the control unit is configured to stop the electric power supply to the motor in a case where the stop-command signal (Sb) is received at the signal processing unit when the electric power supply from the electric-power supply unit to the motor is in process, the control unit is configured to, once the signal processing unit receives the stop-command signal (Sb) and the control unit thereby stops the electric power supply to the motor , maintain a stop-state of power supply to the motor until the signal processing unit receives a permission command signal (Sa) from the external device, and the control unit is configured to, once the signal processing unit receives the stop-command signal (Sb) and the control unit thereby stops the electric power supply to the motor , and subsequently the signal processing unit receives the permission command signal (Sa) from the external device, perform the electric power supply from the electric-power supply unit to the motor under a condition, in which the control unit determines that the trigger switch is in an off-state and the control unit subsequently determines that the trigger switch is in an on-state and the motor is not being driven. <EOS>