NOVELTY - The material has polyrotaxane (I) (5), polymer (3), and an ionic liquid. The polyrotaxane (I) has cyclic molecule (I) (7) and a linear molecule (I) (6) clathrating the cyclic molecule in a skewering form. A sealing group (8) is arranged at both ends of the linear molecule so that the cyclic molecule is not separated from the linear molecule. The polyrotaxane and portion(s) of the polymer are bound via the cyclic molecule.    USE - For lithium ion battery, fuel cell, solar cell, actuator, electrical-double-layer capacitor, light-emitting element, electrochromic element, sensor, ionic circuit, polyelectrolyte, electrochemical material, catalyst, separation membrane and coating agent (all claimed), battery reference material, entertainment material, electrochemical material, catalyst, impact absorbing material such as helmet, sealant, filler for mattress, medical material such as soft contact lens material, artificial lens, hygienic material such as diaper, sanitary napkin and construction material such as moisture absorption gelatinizer, dehumidification agent, artificial snow material, and chromatography support and bioreactor support material.    ADVANTAGE - The material swollen with ionic liquid has favorable flexibility, stretchability and/or viscoelasticity.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for manufacture of the material which has polyrotaxane (I), polymer, and an ionic liquid: The cyclic molecule (I) and linear chain molecule (I) are mixed and the cyclic molecule is included in the linear molecule. Sealing group is arranged at both ends of linear molecule to prepare polyrotaxane (I), and the cyclic molecule is not detached from linear molecule. The polyrotaxane and polymer are mixed and portion(s) of the polymer and polyrotaxane are combined via the cyclic molecule to obtain conjugate. The above processes are performed in ionic liquid or the conjugate obtained above is immersed in ionic liquid, to obtain the material.    DESCRIPTION OF DRAWING(S) - The figure shows conceptual diagram of substances which does not contain ionic liquid among the material.    Substance (1)    Polymer (3)    Polyrotaxane (5)    Straight chain molecule (6)    Cyclic molecule (7)    Sealing group (8)