A suspension device comprising: a suspension including a damping device which is configured to damp a force generated between a vehicle body and a wheel of a motorcycle ; a stroke sensor that is configured to detect a stroke amount (Rp, Rpf, Rpr) of the suspension , the stroke amount (Rp, Rpf, Rpr) being an amount of displacement from a reference extension state of the suspension with respect to an extension direction of the suspension , a control device that is configured to receive output signals (sf, sr) from the stroke sensor , and comprising a damping force control unit that is configured to, when an acceleration (Ap) of a change in the stroke amount (Rp, Rpf, Rpr) is equal to or greater than a predetermined value determined in advance, increase a damping force of the damping device so as to be greater than the damping force generated when the acceleration (Ap) of the change in the stroke amount (Rp, Rpf, Rpr) is less than the predetermined value; and a predetermined value setting unit that is configured to set the predetermined value such that the predetermined value is decreased as the stroke amount (Rp, Rpf, Rpr) is decreased, characterised in that the control device includes a calculation unit , and the calculation unit has a Rp calculation unit , Vp calculation unit , and a Ap calculation unit , the Rp calculation unit is configured to calculate the stroke amount (Rp, Rpf, Rpr) using the signals (sf, sr) from the stroke sensor , the Vp calculation unit is configured to calculate a speed (Vp, Vpf, Vpr) by calculating an amount of change in the stroke amount (Rp, Rpf, Rpr) calculated by the Rp calculation unit per unit time, and the Ap calculation unit is configured to calculate an acceleration (Ap, Apf, Apr) by calculating an amount of change in the speed (Vp, Vpf, Vpr) calculated by the Vp calculation unit per unit time. a suspension including a damping device which is configured to damp a force generated between a vehicle body and a wheel of a motorcycle ; a stroke sensor that is configured to detect a stroke amount (Rp, Rpf, Rpr) of the suspension , the stroke amount (Rp, Rpf, Rpr) being an amount of displacement from a reference extension state of the suspension with respect to an extension direction of the suspension , a control device that is configured to receive output signals (sf, sr) from the stroke sensor , and comprising a damping force control unit that is configured to, when an acceleration (Ap) of a change in the stroke amount (Rp, Rpf, Rpr) is equal to or greater than a predetermined value determined in advance, increase a damping force of the damping device so as to be greater than the damping force generated when the acceleration (Ap) of the change in the stroke amount (Rp, Rpf, Rpr) is less than the predetermined value; and a predetermined value setting unit that is configured to set the predetermined value such that the predetermined value is decreased as the stroke amount (Rp, Rpf, Rpr) is decreased, characterised in that the control device includes a calculation unit , and the calculation unit has a Rp calculation unit , Vp calculation unit , and a Ap calculation unit , the Rp calculation unit is configured to calculate the stroke amount (Rp, Rpf, Rpr) using the signals (sf, sr) from the stroke sensor , the Vp calculation unit is configured to calculate a speed (Vp, Vpf, Vpr) by calculating an amount of change in the stroke amount (Rp, Rpf, Rpr) calculated by the Rp calculation unit per unit time, and the Ap calculation unit is configured to calculate an acceleration (Ap, Apf, Apr) by calculating an amount of change in the speed (Vp, Vpf, Vpr) calculated by the Vp calculation unit per unit time. <EOS>