An electric working machine (1) including: a motor; a control unit configured to control rotation of the motor; a fixed part (3) provided with a handle having a grip portion (43); a movable part (4) held by the fixed part (3) and is configured to be extendible by sliding relative to the fixed part (3); and a cutting blade (155) provided to a end portion of the movable part (4) and is configured to be driven by the motor; characterized in that the electric working machine (1) further includes a detection unit which is connected to the control unit and is configured to detect whether or not the movable part (4) is positioned at a predetermined extended position relative to the fixed part (3).