The aid device comprises: a base, on which the care receiver places his/her feet； a support arm portion, provided on the base, configured to support a part of the care receiver's body and is operable in an upright direction to make the care receiver stand or in a seating direction for seating the care receiver； an actuator configured to drive the support arm portion； a linking mechanism configured to transmit a driving force of the actuator to the support arm portion and allow the position of the support arm portion driven by the actuator to change independently of the driving state of the actuator； and a damping mechanism configured to generate a resistive force for an operation on at least one operating direction of the support arm portion.
