Flow guidance device of a motor vehicle , comprising a spoiler fastened to a tailgate of the motor vehicle, and an adjusting kinematics device for adjusting the spoiler between a rest position, in which the spoiler is arranged flush with the tailgate , and at least one functional position, In which the spoiler is deployed beyond the vehicle contour or the surface of the tailgate with regard to the height and/or angle in order to achieve a downforce effect and/or braking effect and/or aerodynamic improvement during travelling of the motor vehicle , wherein the adjustment of the adjusting kinematics device is carried out via actuable drive means, and wherein the adjusting kinematics arrangement comprises at least one adjusting kinematics unit which is formed from a first adjusting kinematics system and a second adjusting kinematics system operatively coupled to the former, wherein the first adjusting kinematics system is formed as a four-joint and for the adjustment of an exhibition height and the second adjusting kinematics is formed as a four-bar linkage and is formed for the adjustment of a deployment angle, and an adjustment of the spoiler is a superimposed kinematic adjustment movement of the first and second adjusting kinematics systems , and wherein the first adjustment kinematics system can be swivelled via an electric motor as a drive means , and wherein the first adjustment kinematics system comprises at least one immovably mounted swivel axis (S1), and wherein the first adjustment kinematics system comprises a first swivel link having a first end region and a second end region , a coupling link which is of bent configuration in a central region, with a first end region , a second end region and a connecting region formed in the central region, a second swivel link with a first end region and a second end region , and wherein the second adjustment kinematics system can be swivelled via a separately actuable electric motor as a drive means, and wherein the second adjustment kinematics system comprises a immovably mounted swivel axis (S6), characterized in that that the fixed-mounted swivel axis (S1) can be swivelled via the electric motor , and in that the immovably mounted swivel axis (S6) can be swivelled via the electric motor , and in that the second adjustment kinematics system has a double crank with a first double crank arm with a first end region and a second end region , and a second double crank arm with a first end region and a second end region , and a drop arm element with a first end region and a connecting region , wherein the first double crank arm is connected via its second end region in a swivellingly movable manner around a swivel axis (S5) to the first end region 54a of the second double crank arm and is mounted in a swivellingly movable manner around the swivel axis (S6) via its first end region via a bearing-mounted swivel bearing , which is connected directly or by means of a bearing component to the tailgate , and wherein the second double crank arm is mounted via its second end region in a swivellingly movable manner around a swivel axis (S7) at the first end region of the drop arm element and is coupled in an operatively connected manner via its connecting region to the second end region of the coupling link in a pivotally movable manner around a swivel axis (S8), and wherein the drop arm element is firmly attached via its connecting region to a bottom side of the spoiler . <EOS>