INSULATED WIRE

To provide an insulated wire inhibiting occurrence of a partial discharge and a film crack even when the insulated wire is used in a coil of a motor used in high voltage drive and/or inverter drive.SOLUTION: An insulated wire including a conductor formed into a long shape and an insulation film formed by stacking one or a plurality of insulating layers covering the conductor, the insulating layer has a porous region and a resin region. The porous region is formed of a resin and a plurality of voids. The resin region is formed of the resin. In the insulating layer, a boundary surface is not provided between a first boundary surface located on a radially inner side and a second boundary surface located on a radially outer side, and the porous region and the resin region are arranged in this order from the first boundary surface toward the second boundary surface.SELECTED DRAWING: Figure 1 【課題】高電圧駆動やインバータ駆動がなされるモータのコイルに用いられた場合であっても、部分放電の発生を抑制するとともに、皮膜割れの発生を抑制する絶縁電線を提供する。【解決手段】長尺状に形成された導体と、導体の周囲を覆う絶縁層が１つ又は複数積層されて構成された絶縁皮膜と、を有する絶縁電線は、絶縁層は、空孔領域と、樹脂領域とを有する。空孔領域は、樹脂と複数の空孔とにより構成される。樹脂領域は、樹脂により構成される。絶縁層は、径方向内側の第１の界面と径方向外側の第２の界面との間に界面が設けられておらず、かつ、前記第１の界面から前記第２の界面に沿って、空孔領域と樹脂領域とがこの順序で配置されている。【選択図】図１