A motor driver device for driving a motor with a full-bridge circuit includes: a switching driver configured to perform switching driving in which a switching voltage is supplied from the full-bridge circuit to the motor; a linear driver configured to perform linear driving in which a continuous linear voltage is supplied from the full-bridge circuit to the motor; and a control circuit configured to set a driving mode of the motor to a switching driving mode in which the switching driving is performed or a linear driving mode in which the linear driving is performed.