Abstract: A shock absorber testing device wherein the vehicle body is raised relative to the vehicle wheels, and is then released. The vehicle wheels are not raised. Upon releasing of the raised spring-suspended body of the vehicle, the resulting oscillations of the movement of the body is sensed, and various quality factors (h.sub.1, h.sub.2, h.sub.3) are determined and displayed to display the dampening proficiency of the shock absorber. The damping proficiency of a pair of shock absorbers located opposite each other on the vehicle (the pair of front shock absorbers, for example) may have their damping proficiencies displayed simultaneously and compared, and the difference therebetween also displayed to indicate uneven wear or imbalance of the shock absorbers of the vehicle.