Motor drive control device

A motor drive control device that controls a motor with respect to a drive body driven by a control unit that receives power supply from a power source and controls the motor, the motor drive control device comprising:

• a first input unit to which first current from the power source to the control unit is input;
• a first output unit that outputs the first current input from the first input unit to the control unit;
• a shutoff unit that is provided between the first input unit and the first output unit, and switches an output state of the first output unit;
• a second input unit to which second current from the control unit to the motor is input;
• a second output unit that outputs the second current input from the second input unit to the motor;
• and
• an arithmetic unit that is provided between the second input unit and the second output unit, and calculates a rotation speed of the motor.