Electric wire conductor, coated electric wire, and wire harness

The invention provides an electric wire conductor capable of achieving both flexibility and space-saving performance, and a coated electric wire and a wire harness provided with such an electric wire conductor. An electric wire conductor (10) is configured from a twisted wire in which a plurality of wire rods (1) are twisted, and has a flat section in which a cross-section intersecting the axial direction of the twisted wire is configured from a flat shape. The porosity, which is the ratio of voids not occupied by the wire in the cross-section of the flat portion, is 17% or more. Also provided is a coated electric wire having such an electric wire conductor (10) and an insulator that covers the outer periphery of the electric wire conductor (10). Also provided is a wire harness comprising such a coated electric wire. 本发明提供一种能够兼顾柔性和省空间性的电线导体及具备这样的电线导体的被覆电线以及线束。设为由将多个线材(1)绞合而成的绞合线构成且具有与绞合线的轴线方向交叉的剖面由扁平形状构成的扁平部的电线导体(10)。将在扁平部的剖面中未被线材占据的空隙的比例即空隙率设为17％以上。另外，设为具有这样的电线导体(10)和将电线导体(10)的外周被覆的绝缘体的被覆电线。此外，设为包括这样的被覆电线而构成