It is enabled to facilitate fine adjustment of power as well as reduction of the amount of movement required to maximize the power. An actuator 13 is moved by operation of a user. A pressure sensitive sensor 15 detects applied pressing force. A pressing member 14 presses the pressure sensitive sensor 15. When the amount of movement of the actuator 13 is smaller than a predetermined amount, the pressing member 14 presses the pressure sensitive sensor 15 to apply force corresponding to the amount of movement of the actuator 13. When the amount of movement of the actuator 13 is not smaller than the predetermined amount, the pressing member 14 presses the pressure sensitive sensor 15 to apply force corresponding to pressing force applied to the actuator 13 by the user.