Core unit and wire harness

A wire harness comprising:

• a magnetic substance core formed in an annular shape;
• electric wires of plural phases, the electric wires being wound around the magnetic substance core at respective positions that are different from each other about an axis of the magnetic substance core;
• and
• a restriction member configured to restrict displacement of the electric wires about the axis of the magnetic substance core, the electric wires being wound around the magnetic substance core, wherein
• the restriction member includes a body fixed to one end of the magnetic substance core in the axial direction of the magnetic substance core, the body including a plurality of cutout portions formed in edge portions of the body, and
• the cutout portions separately surround the respective electric wires of each phase wound around the magnetic substance core from an inside of the magnetic substance core in a radial direction with the axis of the magnetic substance core as a center.