An aid device configured to assist a transfer operation of a care receiver, the aid device comprising: a base; an arm provided on the base in a front-rear swingable manner; a support portion, being provided on the arm in a front-rear swingable manner, which is configured to support a part of the care receiver's body; an actuator, having a main body portion provided on the base in a front-rear tiltable manner and a movable portion extending and contracting from the main body portion; a linking mechanism comprising a first linking member, provided on the arm in a swingable manner and connected to the movable portion; and a second linking member, fixed to the support portion and configured to engage with the first linking member, wherein the first linking member comprises: a support point supported by the arm in a swingable manner; a forearm portion, extending forward from the support point and connected to the movable portion, which is configured to abut a restricting member provided on the arm, and a rear arm portion, extending rearward from the support point, which is configured to engage with the second linking member, the linking mechanism is configured to transmit a first operation to the forward swing of the support portion, said transmitting includes extending the movable portion from a contracted position to a predetermined intermediate position in which the forearm portion comes in contact with the restricting member provided on the arm thereby causing the upper body of the care receiver to tilt in the forward direction, and is further configured to transmit a second operation to the forward swing of the arm, said transmitting includes extending the movable portion from the intermediate position to an extended position, thereby tilting the actuator in the forward direction and causing the upper body of the care receiver to tilt further forward while causing the upper body of the care receiver to move obliquely upward and forward; and an arm restricting mechanism configured to restrict the forward swing of the arm with an external force other than the actuator. a base; an arm provided on the base in a front-rear swingable manner; a support portion, being provided on the arm in a front-rear swingable manner, which is configured to support a part of the care receiver's body; an actuator, having a main body portion provided on the base in a front-rear tiltable manner and a movable portion extending and contracting from the main body portion; a linking mechanism comprising a first linking member, provided on the arm in a swingable manner and connected to the movable portion; and a second linking member, fixed to the support portion and configured to engage with the first linking member, wherein the first linking member comprises: a support point supported by the arm in a swingable manner; a forearm portion, extending forward from the support point and connected to the movable portion, which is configured to abut a restricting member provided on the arm, and a rear arm portion, extending rearward from the support point, which is configured to engage with the second linking member, a support point supported by the arm in a swingable manner; a forearm portion, extending forward from the support point and connected to the movable portion, which is configured to abut a restricting member provided on the arm, and a rear arm portion, extending rearward from the support point, which is configured to engage with the second linking member, the linking mechanism is configured to transmit a first operation to the forward swing of the support portion, said transmitting includes extending the movable portion from a contracted position to a predetermined intermediate position in which the forearm portion comes in contact with the restricting member provided on the arm thereby causing the upper body of the care receiver to tilt in the forward direction, and is further configured to transmit a second operation to the forward swing of the arm, said transmitting includes extending the movable portion from the intermediate position to an extended position, thereby tilting the actuator in the forward direction and causing the upper body of the care receiver to tilt further forward while causing the upper body of the care receiver to move obliquely upward and forward; and an arm restricting mechanism configured to restrict the forward swing of the arm with an external force other than the actuator.