A motor drive device according to one aspect of the present invention includes an operation switch, a control unit, an adjusting unit, and a normal/reverse changeover switch. The control unit is configured, in a case where the operation switch is in an on state, to control a current flowing to the motor based on a control target value adjusted by the adjusting unit when a rotational direction of a motor is set to a normal direction by the normal/reverse changeover switch and to control the current flowing to the motor based on a preset fixed reverse rotation control target value used to reversely rotate the motor, regardless of the control target value set by the adjusting unit, when the rotational direction is set to a reverse direction by the normal/reverse changeover switch.
