Insulated electrical wire and resin composition

An insulated wire comprising:

• a conductor (A);
• and
• an insulating layer (B) around the conductor (A),
• the insulating layer (B) comprising an aromatic polyetherketone resin (I) and a fluorine-containing copolymer (II) and having a melt viscosity at 60 sec−1 and 390° C. of 0.40 to 0.75 kPa·s,
• the aromatic polyetherketone resin (I) having a melt viscosity at 60 sec−1 and 390° C. of 0.30 kPa's or lower,
• the insulating layer (B) having a thickness of 30 to 300 μm,
• the insulating layer (B) having a ratio by mass (I):
• (II) of the aromatic polyetherketone resin (I) to the fluorine-containing copolymer (II) of 80:20 to 40:60,
• the aromatic polyetherketone resin (I) is selected from the group consisting of a polyetherketoneketone (PEKK) and polyetheretherketone (PEEK),
• the fluorine-containing copolymer (II) is a copolymer of tetrafluoroethylene (TFE) and a perfluoroethylenic unsaturated compound represented by the following formula (1);
• wherein, in formula (1), Rf1 is —CF3 or —ORf2;
• and Rf2 is a C1-C5 perfluoroalkyl group.