Insulated electric wire and harness with water-stopping agent and wire harness

An insulated electric wire comprising:

• a conductor in which a plurality of elemental wires made of a metal material are twisted together;
• and
• an insulation covering that covers an outer circumference of the conductor,
• wherein the insulated electric wire comprises:
• an exposed portion in which the insulation covering is removed from the outer circumference of the conductor;
• a covered portion in which the insulation covering covers the outer circumference of the conductor, the exposed portion and the covered portion being provided adjacent to each other in a longitudinal axis direction of the insulated electric wire;
• and
• a water-stopping portion in which gaps between the plurality of elemental wires in the exposed portion are filled with a water-stopping agent, and
• at least a portion of the water-stopping agent that is in contact with the plurality of elemental wires is made of a resin material that cures upon contact with the metal material of the plurality of elemental wires,
• wherein density of the metal material per unit length is higher in the exposed portion than in at least a remote area of the covered portion other than an area adjacent to the exposed portion.