Importance

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Abstract

An electrical power tool capable of suppressing increase in a size of a device main body in a radial direction of an electrical motor is provided. A driver which drives a distal end tool with a power of an electrical motor includes: a casing in which the electrical motor is provided; a driven gear and a spindle which are arranged eccentrically with respect to an output shaft of the electrical motor and which transmit power of the output shaft to the distal end tool; and a power supply circuit unit arranged inside the casing. And, an arrangement region of the driven gear and the spindle and an arrangement region of the power supply circuit unit are at least partially overlapped with each other in a circumferential direction centering the output shaft.

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First Claim