Shielded electric wire including a conductor having outer diameter set based on thermal expansion and an insulator having thickness based on thermal expansion and wire harness

A shielded electric wire comprising:

• one metal pipe having a tubular shape;
• and
• an electric wire being only one electric wire provided in the one metal pipe, and having a conductor and an insulator provided on an outer circumference of the conductor;
• and
• a thermoplastic elastomer that fills a space between the one metal pipe and the only one electric wire, wherein
• when an outer diameter of the conductor at 25° C. is set as a, a coefficient of linear expansion of a conductor material of the conductor is set as αa, and a temperature difference between a maximum temperature exposed in an environment where the electric wire is used and 25° C. is set as Δt, an outer diameter a′ of the conductor after thermal expansion with respect to the maximum temperature is a′=a+αa×a×Δt, and when a wall thickness of the insulator at 25° C. is set as b and a coefficient of linear expansion of an insulator material of the insulator is set as ab, an insulator wall thickness b′ after thermal expansion with respect to the maximum temperature is b′=b+αb×b×Δt;
• and
• at the maximum temperature exposed in the environment where the electric wire is used, an inner diameter c of the one metal pipe is set to satisfy c≥a′+2b′
• wherein an axis line of the thermoplastic elastomer coincides with an axis line of the electric wire.