Almost all the amputees feel the existence of the amputated limb after limb amputation, which is known to be phantom limb. Many amputees can move and control their phantom limb at their will and they report that they receive sensory feedback of the phantom limb while phantom limb moving. Further, approximately 50–80% of them have pain on the amputated limb, phantom limb pain. A possible mechanism for phantom limb is that the information of the body in the amputee's brain is not updated after amputation for some reason, causing this illusory feeling of the amputated limb. This phenomenon suggests that our body perception depends largely on the body information in the brain formed from sensory information of multimodal sensors in the body. For understanding the mechanism of our perceptual system, to examine the mismatch between actual sensory information in the environment and our perception is very useful. Thus, to elucidate the phantom limb will provide us with rich information to help understand the mechanism of our body perception.