An insulated wire including a laminated resin-coated insulated wire containing: a thermosetting resin layer (A) directly or via an insulating layer (D) on a conductor having a rectangular cross-section; and at least a thermoplastic resin layer (B) on the outer periphery of the thermosetting resin layer (A), in which the cross-sectional shape of the thermosetting resin layer (A) composed of two pairs of two sides facing each other, and has at least four convex portions each of which has a film thickness in maximum, at least one convex portion of the at least four convex portions is on each of the four sides, or at least two convex portions of the at least four convex portions are at least on each of the two sides facing each other, and in the each side having the convex portion, provided that a minimum film thickness is designated as “a” pm, and an average of maximum film thicknesses of the convex portions is designated as “b” pm, the a/b ratio is 0.60 or more and 0.90 or less; a coil, and electric/electronic equipment.