An assist device includes a body-worn component that is worn at least around a hip of a user, a thigh unit that is mounted on the body-worn component and each thigh of the user, a torque generation unit having an actuator configured to generate assist torque, a control box disposed above the hip of the user on the body-worn component, the control box accommodating the torque generation unit and a controller configured to control the torque generation unit, and a power transmission unit configured to transmit assist torque generated in the control box to the thigh unit. The assist device reduces a load on a lower back of the user by assisting the user with a movement of each thigh relative to the lower back.
