Isolated cable and wiring harness

An insulated wire having an insulating layer made of a composition comprising: (A) 96 to 44 parts by weight of a polyester type resin; (B) 4 to 56 parts by weight of a polyphenylene ether type resin; (C) 1 to 70 parts by weight of one or more kinds of polymers selected from the group consisting of styrene type polymer, olefin type polymer having a functional group and polymer having an ester group based on 100 parts by weight of the polyester type resin (A) and the resin of the type polyphenylene ether (B); and (D) 1 to 50 parts by weight of a phosphoester compound based on 100 parts by weight of a polyester type resin (A) and a polyphenylene ether type resin (B).