Flexible flat cable

1. A flexible flat cable, comprising:

a plurality of conductors arranged parallel at predetermined intervals;

an insulation layer covering both sides of each of the plurality of conductors;

a nonwoven fabric layer on an outer surface of the insulation layer; and

a shield layer on an outer surface of the nonwoven fabric layer,

wherein the nonwoven fabric layer comprises a nonwoven fabric comprising a layer comprising a first fiber thread with a predetermined outer diameter and a second fiber thread with an outer diameter larger than that of the first fiber thread, and

a basis weight of the nonwoven fabric is 50 to 90 g/m 2 .

2. The flexible flat cable according to claim 1 , wherein the nonwoven fabric comprises a first layer comprising the first fiber thread, a second layer comprising the second fiber thread and formed on both sides of the first layer, and a third layer comprising the first and second fiber threads and formed between the first and second layers.

3. The flexible flat cable according to claim 1 , wherein a void content of the nonwoven fabric is 170 to 280 cm 3 /m 2 .

4. The flexible flat cable according to claim 1 , wherein the shield layer comprises a shield material including metal foil wound around the nonwoven fabric layer.

5. The flexible flat cable according to claim 1 , wherein the insulation layer comprises an insulating film comprising one of polyethylene terephthalate, polyethylene naphthalate and polyphenylene sulfide, and

an insulating and flame-retardant adhesive applied onto a surface of the insulating film.