Insulated wire excellent in bending resistance, as well as coil and electric or electronic equipment using the same

An insulated wire having an insulating coat layer comprising a thermoplastic resin on an outer peripheral surface of a conductor having a rectangular cross-sectional shape and also having a long side, a short side, and a corner portion having a curvature radius Rc,

• wherein a thickness t1 (μm) of the insulating coat layer covered on a surface which is continuing in an axial direction of the conductor, and which layer includes a long side of a transverse section of the conductor, a thickness t2 (μm) of the insulating coat layer covered on the surface which is continuing in the axial direction of the conductor, and which layer includes a short side of the transverse section of the conductor, and a corner portion thickness t3 (μm) of the insulating coat layer satisfy formula (1):
• t3/{(t1+t2)/2}≥1.2 Formula (1)
• wherein the t1 (μm) and t2 (μm) are each independently 20 μm or more and 50 μm or less, and
• wherein a ratio of a cross-sectional area Sc (mm2) of the conductor to a cross-sectional area Sw (mm2) of the insulated wire satisfies formula (2):
• 1.0>Sc/Sw≥0.8. Formula (2)