Abstract: To provide a cordless electric tool promoting a fastening function or a cutting function by facilitating to control a rotational number of a motor from a low speed region to a high speed region, reducing generation of vibration or noise and achieving small-sized formation and light-weighted formation, there is provided a cordless electric tool constituted by a brushless direct current motor 3, an output shaft 5 connected to the brushless direct current motor 3 via a speed changing device 4, a motor driving circuit 7 and a control portion 8 of the driving circuit and using a charge type battery 11 as a drive power source.