PROBLEM TO BE SOLVED: To provide a portable electric working machine that, even when a battery is replaced with a spare battery, can be moved to a place where the spare battery is disposed while work is continued, and can avoid the deterioration of working efficiency.SOLUTION: A portable electric working machine includes: a battery 2; a motor 3 driven by the battery 2; a working part 4 operated by the rotation of the motor 3; and a control part 5 for controlling the motor 3. The control part 5 includes a battery voltage detection part 5A for detecting a voltage of the battery 2, and a motor control part 5B for stopping the rotation of the motor 3 when the voltage detected by the battery voltage detection part 5A decreases to a preset voltage or lower. The preset voltage is set so as to leave the battery capacity with which the working part 4 can be continuously operated for a predetermined time.COPYRIGHT: (C)2015,JPO&INPIT【課題】予備バッテリへの交換を行う場合にも、作業を継続しながら予備バッテリの配備場所まで移動することができ、作業効率の低下を回避することができる。【解決手段】バッテリ2と、バッテリ2によって駆動するモータ3と、モータ3の回転によって動作する作業部4と、モータ3を制御する制御部5とを備える。制御部5は、バッテリ2の電圧を検知するバッテリ電圧検知部5Aと、バッテリ電圧検知部5Aが検知する電圧が設定電圧以下になったときにモータ3の回転を停止させるモータ制御部5Bを備える。設定電圧が作業部4を所定時間継続動作させることができるバッテリ容量を残すように設定されている。【選択図】図1