Electric power tool

An electric power tool comprising:

• a motor as a driving power source for generating rotational power;
• a speed reducer unit arranged to deliver the rotational power of the motor and provided with two or more gears;
• a driving unit arranged to deliver the rotational power from the speed reducer unit to a tip end tool;
• a housing arranged to accommodate the motor, the speed reducer unit and the driving unit therein and provided with a handle portion;
• and
• a speed changing unit for changing a gear reduction ratio of the speed reducer unit, the speed changing unit arranged in such a position as to be operable outside the housing,
• wherein the speed changing unit comprises an operation lever slidingly operable in a speed changing direction when pushed, an operation detector unit for detecting the operation lever to control electric power supplied to the motor, a shift unit for changing the gear reduction ratio of the speed reducer unit in response to sliding movement of the operation lever, and a slide restraint unit for restraining the sliding operation of the operation lever until the operation detector unit detects the operation lever.