An assist device includes a body wearing unit and an actuator unit. The actuator unit includes an output link configured to pivot about a joint of an assist target body part and to be attached to the assist target body part; an actuator including an output shaft configured to generate an assist torque via the output link; a torque determination unit configured to determine a combined torque obtained by combining a user torque and the assist torque from the output shaft, the user torque being input from the output link when the user causes the assist target body part to pivot; a correction unit configured to calculate a correction amount for the determined combined torque; and a pivot angle control unit configured to control a pivot angle of the output shaft based on the determined combined torque and the calculated correction amount.