The utility model provides an edge -trimmer. How this an edge -trimmer can can both suitably prune the operation at the state (pruning the state of object thing) that suppresses electric power in extravagant, no matter load. This an edge -trimmer can include: action bars, rotary tool, electric motor, rotatory test section, command settlement portion, electric motor control part, load test section, and from the moving -target switching part. Wherein electric motors rotation is controlled to the electric motor control part based on the physical quantity that is detected out by rotatory test section for electric motors rotational speed become by command settlement portion sets for the target rotational speed, the target switching part switches the current target rotational speed of setting for of command settlement portion according to the load that the load test section detected.
