To effectively mitigate damage to cultural objects in museums, we have developed a rolling-type horizontal isolation device which can be used for showcases for cultural objects. In order to evaluate its performance, we made two showcase models in each of which a cultural relic imitation was placed in a freestanding way, and carried out shaking table tests on them for comparison. One showcase was placed freestanding directly on the bed of the shaker table, while the other was fixed at the bottom to the isolation device which was then placed freestanding on the shaker table. The results show that, compared with the non-isolation case, the isolation system has a smaller basic frequency and a larger damping ratio. Under the effects of horizontal earthquakes, utilization of the isolation device results in smaller displacement and acceleration responses, but its dynamic magnification coefficient still sometimes exceeds 1. Furthermore, the reset ability of the isolation device also needs improvement. It is suggested that measures need to be taken to further decrease the basic frequency, increase the damping ratio, and improve the machining precision, etc. of the isolation device.