To provide a void-including material, high in weight, excellent in flame resistance, antibacterial properties, high in compressive elasticity, high in air-permeability, etc., and suitable for use in a wide range of industrial and manufacturing fields.

This void-including material 1 is constituted of a fiber material and an upper surface part 2 and a lower surface part 3 in which numerous hexagonal openings 2a and 3a are formed are connected to be integrated with supporting threads 4. When one surface out of the upper surface 2 and the lower surface 3 is brought to a base surface, a relative position of the hexagonal openings 2a and 3a in the upper surface 2 and the lower surface 3 is sifted to anyone of positions to right and left and/or above and below and interior angles of the supporting threads, which support the openings 2a and 3a of the upper surface 2 and the lower surface 3, against the upper surface 2 and the lower surface 3 are mixed within the range of 30-90° depending on regularity of the openings 2a and 3a. The thickness of this material is 5-40nm and the amount of the fiber filled up in a unit volume is ≤10%.