The present invention was devised in consideration of the above-described circumstances and provides a performance evaluation apparatus and performance evaluation method capable of efficiently evaluating the performance of a wearable motion assistance device, which assists motions of a wearer's lower back part, by using a comparatively simple configuration. In a state where the wearable motion assistance device is secured and mounted on both femur links and a trunk link, torque acting on an axis line of a pitch direction relative to the trunk link for each hip joint is detected while controlling driving forces by first and second driving sources so that a posture of the trunk link and rotation angles of each hip joint and each knee joint virtually match motions of the lower back part of the wearer； and performance of an assist force by the wearable motion assistance device is evaluated on the basis of a detection result of the torque according to drive control of the first and second driving sources.
