An insulated wire having: a conductor, a baked enamel layer containing at least a polyamide-imide provided on the outer periphery of the conductor directly or through an insulated layer, and at least one extrusion-coated resin layer provided on the outer side of the baked enamel layer, wherein the baked enamel layer has at least one functional group selected from the group consisting of a carboxyl group, an ester group, an ether group and a hydroxyl group on the outer surface thereof, and adheres to the extrusion-coated resin layer.