An electric power tool comprising: a manually-operated member moved in a first operation direction and a second operation direction opposite to the first operation direction, the manually-operated member including a movable contact; and a circuit board configured to generate a voltage signal depending on an operation amount of the manually-operated member, wherein the circuit board includes a plurality of electrodes (P1a-PZa, P1b-PZb), the movable contact is arranged to make sliding contact with the circuit board and contacts one of the plurality of electrodes (P1a-PZa, P1b-PZb) depending on the operation amount of the manually-operated member, a motor, a first subset of electrodes (P1a-PZa) among the plurality of electrodes is arranged in a first region of the circuit board corresponding to the first operation direction of the manually-operated member, a second subset of electrodes (P1b-PZb) among the plurality of electrodes is arranged in a second region of the circuit board corresponding to the second operation direction of the manually-operated member, and the electrodes of the first and second subsets are electrically connected in common to a variable resistor unit, the electric power tool is characterized in that the electric power tool is further configured such that, when the manually-operated member is moved in the first operation direction and the movable contact connects to one of the first subset of electrodes (P1a-PZa), the motor rotates in a normal rotation direction, and when the manually operated member is moved in the second operation direction and the first movable contact connects to one of the second subset of electrodes (P1 b-PZb), the motor rotates in a reverse rotation direction. a manually-operated member moved in a first operation direction and a second operation direction opposite to the first operation direction, the manually-operated member including a movable contact; and a circuit board configured to generate a voltage signal depending on an operation amount of the manually-operated member, wherein the circuit board includes a plurality of electrodes (P1a-PZa, P1b-PZb), the movable contact is arranged to make sliding contact with the circuit board and contacts one of the plurality of electrodes (P1a-PZa, P1b-PZb) depending on the operation amount of the manually-operated member, a motor, a first subset of electrodes (P1a-PZa) among the plurality of electrodes is arranged in a first region of the circuit board corresponding to the first operation direction of the manually-operated member, a first subset of electrodes (P1a-PZa) among the plurality of electrodes is arranged in a first region of the circuit board corresponding to the first operation direction of the manually-operated member, a second subset of electrodes (P1b-PZb) among the plurality of electrodes is arranged in a second region of the circuit board corresponding to the second operation direction of the manually-operated member, and the electrodes of the first and second subsets are electrically connected in common to a variable resistor unit, the electric power tool is characterized in that the electric power tool is further configured such that, when the manually-operated member is moved in the first operation direction and the movable contact connects to one of the first subset of electrodes (P1a-PZa), the motor rotates in a normal rotation direction, and when the manually operated member is moved in the second operation direction and the first movable contact connects to one of the second subset of electrodes (P1 b-PZb), the motor rotates in a reverse rotation direction.