Ionic Conducting Elastomer(ICE) is a stretchable elastomer that can possess ionic conductivity. Because of it’s mechanical robustness, the ICE attracts wide attention for a variety of applications such as stretchable electronics, electronic skins and wearable electronic devices. It has been known that the flexibility of the ICE is dependent on the cross-linking density of the elastomer. In general, the mechanical strength of the elastomer could be significantly reduced if high flexibility is obtained due to the low cross-linking density. Therefore, novel type of cross-linker that can simultaneously increase the flexibility and the mechanical property is required. In this research, an ionic conducting elastomer with high elasticity and transparency was developed by introducing a slidable supramolecular cross-linker. Functionalized polyrotaxane cross-linker allows the elastomer to show high elasticity and sufficient mechanical toughness.