An electric operating machine comprising a motor and a power circuit driving said motor by an electric power supplied from a battery , the power circuit comprising a current detection part adapted to output a voltage lowering signal when a current value of a current flowing through a given part of said power circuit satisfies a first given criterion, said power circuit comprising: a voltage conversion part adapted to convert an input voltage entered in accordance with a voltage of said battery to generate an output voltage and outputting said generated output voltage to said motor, and a voltage control part adapted to provide a voltage detection signal in accordance with the output voltage of the voltage conversion part to the voltage conversion part, characterized in that : said voltage conversion part is adapted to lower the voltage value of a new output voltage being generated when said current detection part outputs said voltage lowering signal, said voltage conversion part is adapted to convert the input voltage from the battery in accordance with the voltage detection signal to generate a target output voltage, the target output voltage being the input voltage to said motor and higher than the output voltage of the battery, and said voltage conversion part is adapted to lower the voltage value of a new output voltage being generated when said voltage lowering signal is supplied, the voltage value of the new output voltage being lower than the target output voltage. a voltage conversion part adapted to convert an input voltage entered in accordance with a voltage of said battery to generate an output voltage and outputting said generated output voltage to said motor, and a voltage control part adapted to provide a voltage detection signal in accordance with the output voltage of the voltage conversion part to the voltage conversion part, characterized in that : said voltage conversion part is adapted to lower the voltage value of a new output voltage being generated when said current detection part outputs said voltage lowering signal, said voltage conversion part is adapted to convert the input voltage from the battery in accordance with the voltage detection signal to generate a target output voltage, the target output voltage being the input voltage to said motor and higher than the output voltage of the battery, and said voltage conversion part is adapted to lower the voltage value of a new output voltage being generated when said voltage lowering signal is supplied, the voltage value of the new output voltage being lower than the target output voltage. said voltage conversion part is adapted to lower the voltage value of a new output voltage being generated when said current detection part outputs said voltage lowering signal, said voltage conversion part is adapted to convert the input voltage from the battery in accordance with the voltage detection signal to generate a target output voltage, the target output voltage being the input voltage to said motor and higher than the output voltage of the battery, and said voltage conversion part is adapted to lower the voltage value of a new output voltage being generated when said voltage lowering signal is supplied, the voltage value of the new output voltage being lower than the target output voltage. <EOS>