Shift device

A shift device configured to be mounted on a vehicle, the shift device comprising:

• a shift switching member that includes a plurality of valley parts corresponding to a shift position;
• a positioning member that is provided to establish the shift position in a state of being fitted into any one of the plurality of valley parts of the shift switching member;
• a motor including a rotor and a stator and driving the shift switching member;
• a speed reduction mechanism section that rotates the shift switching member in a state in which a rotation speed transmitted from the motor is reduced;
• a rotor rotational angle sensor that detects a rotational angle of the rotor;
• and
• an output shaft rotational angle sensor that detects a rotational angle of the shift switching member, wherein
• a width of a backlash included in the speed reduction mechanism section is detected based on an output value of the output shaft rotational angle sensor and an output value of the rotor rotational angle sensor while moving the positioning member so as to continuously pass through the plurality of the valley parts by moving in one direction without reciprocating to another direction while passing through the plurality of valley parts, and
• the rotational angle of the rotor corresponding to a center of the backlash is calculated based on the detected width of the backlash, and the rotational angle of the motor corresponding to the center of the backlash is acquired based on association between the calculated rotational angle of the rotor corresponding to the center of the backlash and the output value of the output shaft rotational angle sensor corresponding to a valley bottom of the valley part.