Earlier, we developed multinetwork elastomer by using a covalent bond, hydrogen bond, and clay plane bond. By taking advantage of the characteristics of each cross-linking, the thermoplastic elastomer shows excellent compression set resistance, good flowability, and high tensile properties. In the previous report, it was thought that the crosslinked part was hydrogen bonded to the end face of clay. However, it was estimated that the crosslinked part also has electrostatic interaction with ammonium salts on the clay surface by TEM, IR, and AFM measurements, and new estimated structure was proposed. In addition, it was found that the addition effect of organic clay was a specific phenomenon in the multinetwork elastomer from the comparison with the hydrogen bond crosslinking elastomer. In a hydrogen bond crosslinking elastomer that expresses physical properties only by hydrogen bond, the interaction between the clay and the hydrogen bond crosslinking weakened hydrogen bond crosslinking between polymers to caused deterioration of physical properties. However, in the multinetwork elastomer with stable covalent crosslinking, crosslinking does not change, and the hydrogen bond crosslinking site interacted with clay surface to caused non-localization of the crosslinking part. Therefore, the physical properties have been improved.