An electric cable cutter used with a hand-held tool includes a housing a pair of cutting blades supported by the housing a pair of orthogonal gears a drive shaft with an eccentric shaft portion attached to an output gear of the pair of orthogonal gears a differential gear mechanism which decelerates a rotation of the drive shaft and an Oldham coupling which corrects an eccentric rotation of an output gear of the differential gear mechanism. A circular-arc-shaped outer surface of the one cutting blade is supported by the other cutting blade so as to be openable and closable. The pair of cutting blades is provided with an outer toothed portion engaging with an output gear of the Oldham coupling. An input gear of the pair of orthogonal gears is connected through an adapter pin to the hand-held tool attachable and detachable through a one-touch operation.
