An object is to enable accurate measurement of dynamic torsional characteristics of a damper assembly. A measuring device measures an angular speed (d&thgr;1/dt) of an input rotary member, an angular speed (d&thgr;2/dt) of an output rotary member and a torque (T1) transmitted to the input rotary member. A torsion angle (&thgr;) of a damper unit is calculated by integrating the angular speeds (d&thgr;1/dt) and (d&thgr;2/dt) of the input and output rotary members. A torque (T) acting on the damper unit is calculated by subtracting a product of an angular acceleration (d2&thgr;1/dt2) of the input rotary member calculated by differentiating the angular speed (d&thgr;1/dt) of the input rotary member and a moment of inertia (I1) of the input rotary member from the torque (T1) transmitted to the input rotary member.