To provide an electric tool capable of improving workability.

A control part 23, when a speed reduction ratio of a power transmission part 22 is small, controls in such a manner that the speed reduction ratio becomes large by controlling an actuator 27 for transmission when a battery voltage detected by a voltage sensor S becomes equal to or less than a predetermined voltage. By making the speed reduction ratio large this way, influence of an internal resistance in a battery pack 12 can be reduced, so that work can be continued and it can contribute to the improvement of workability. Also, the control part 23, when the speed reduction ratio of the power transmission part 22 is large, stops the drive of a motor 21 when the battery voltage detected by the voltage sensor S becomes equal to or less than the predetermined voltage.