Non-Woven Fabric

2:

• The nonwoven fabric according to claim 1, which further comprises non-fibrillated fibers.

3:

• The nonwoven fabric according to claim 1, wherein the average fiber length of the fibrillated fibers is 25 μm or greater.

4:

• The nonwoven fabric according to claim 2, wherein the tensile modulus of the non-fibrillated fibers is 5 GPa or higher.

5:

• The nonwoven fabric according to claim 1, wherein the unit thickness flow resistance is 1,400,000 Ns/m4 to 5,000,000,000 Ns/m4.

6:

• The nonwoven fabric according to claim 1, wherein the tortuosity is 1.8 to 12.0.

7:

• The nonwoven fabric according to claim 1, wherein the fibrillated fibers are one or more selected from the group consisting of microfibrillated cellulose, acrylic pulp, aramid pulp, chitin nanofibers, chitosan nanofibers and silk nanofibers.

8:

• The nonwoven fabric according to claim 1, wherein the fibrillation index of the fibrillated fibers is 0.3% or greater.

9:

• The nonwoven fabric according to claim 1, wherein the fibrillated fiber content is 3 mass % to 30 mass % based on the total mass of the nonwoven fabric.

10:

• The nonwoven fabric according to claim 1, wherein the average fiber length of the fibrillated fibers is 200 μm or smaller.

11:

• The nonwoven fabric according to claim 1, wherein the tensile modulus is 40 MPa to 1000 MPa.

12:

• The nonwoven fabric according to claim 2, wherein the tensile modulus of the non-fibrillated fibers is 500 GPa or higher.

13:

• A soundproof material comprising a nonwoven fabric according to claim 1.

14:

• A composite soundproof material obtained by layering a soundproof material according to claim 13 with a support.

15:

• The soundproof material according to claim 13, which is a three-dimensional soundproof material for an automobile.

16:

• The soundproof material according to claim 14, which is a three-dimensional soundproof material for an automobile.