Self-bonding coil line

A self-adhesive insulated wire having an improved chemical stability without any decrease in heat-resistance or flexibility; and a self-adhesive insulating material for the wire. In an existing self-adhesive insulated wire, a thermoplastic resin has only a small amount of active groups and, therefore, a crosslinking should be added in excess. As a result, there arises a problem that the conditions for enamel baking are seriously restricted. In the case of using such a wire in a specific environment (for example, in an insulating oil), moreover, there arises another problem that a hardening agent contained in excess reacts with various chemicals. To overcome these problems, it is intended to provide a self-adhesive insulated wire wherein a thermosetting self-adhesive insulating material, which contains, as the active components, a resin coating comprising a resin base containing a polyhydroxy ether resin having a molecular weight of at least 20,000 and a polysulfone resin and a crosslinking agent having two functional groups per molecule, is applied to a conductor either directly or via another insulating film and then baked. The self-adhesive insulating material as described above is to be used in the self-adhesive insulated wire.