Earthworms move through narrow spaces by peristaltic movements. In Nakamura group, we are developing a robot that simulates the peristaltic movement of an earthworm by using our original artificial muscles as its constituent parts which "contract and expand" by air pressure. This system does not require moving space for its direction change; it can be applied for in-pipe inspection, mixing and separation of solid-liquid mixtures, pumps for solid-liquid mixtures and high viscosity fluids for transportation of sludge, food, cement, etc., and excavation in the ground in combination with an earth auger. We welcome companies that are motivated to commercialize and utilize this technology. The body of an earthworm consists of about 150 segments, each of which is stretched and contracted to perform peristaltic movements. Peristaltic movement is a movement found in human esophagus and intestines and allows objects to be transferred by moving longitudinal expansion and contraction waves in a certain direction. Although peristaltic movement is slow and appears to be inefficient, it has advantages such as the smallest space required for movement and the ability to secure large area in the surrounding environment. As it moves forward, the earthworm first contracts the body segments of the head and then propagates this contraction to the posterior segments of the body. The contraction of this body segment causes friction with the ground. They then move forward by extending the contracted body segments.