Wire conductor, insulated wire, and wire harness

A wire conductor comprising:

• a lower strand layer in which a plurality of strands formed by twisting together a plurality of bare wires made of aluminum or an aluminum alloy are bundled and twisted together;
• and
• an upper strand layer formed by twisting a plurality of strands around an outer circumference of the lower strand layer,
• wherein in a cross section of the wire conductor that is orthogonal to its axial direction, a proportion of an area occupied by gaps formed between the lower strand layer and the upper strand layer to an area of gaps that are not occupied by the bare wires is 63% or less,
• wherein a twist pitch of the strands of the lower strand layer is at least 200 times as large as an outer diameter of the bare wires, and
• a twist pitch of the strands of the upper strand layer is at least 250 times as large as the outer diameter of the bare wires.