To obtain a fiber structure that is provided with a new air layer and has an excellent heat retaining property, antistatic property and durability without impairing an air layer which a fiber structure essentially possesses.

The fiber structure comprises a resin film obtained by polymerizing a polymerizable monomer containing a blowing agent on a fiber formed on a fiber surface. The resin film has foams and is obtained by polymerizing a polymerizable monomer containing at least two or more acrylic groups and/or methacrylic groups at both terminals or one terminal of a main chain containing a polyalkylene oxide segment or at the side chains of the main chain.