Current sensor and current detection unit using the same

A current detection unit comprising:

• a current sensor including:
• parallel electric wire sections of a pair of electric wires arranged in parallel with each other and adapted to flow respective electric currents of the same intensity in directions opposite to each other;
• and
• a magnetic detection device having a magnetic body adapted to allow high frequency currents to directly flow through it and change its magnetic permeability in response to the external magnetic field,
• said magnetic detection device having a magnetic field detecting direction rectangular relative to a prolonged line and being adapted to detect the difference between the magnetic field formed by the parallel electric wire section located close to the magnetic detection device and the magnetic field formed by the parallel electric wire section located remote from the magnetic detection device and directed oppositely relative to the former magnetic field in order to detect the intensity of the electric currents flowing through said parallel electric wire sections;
• a circuit substrate carrying said magnetic detection device and said parallel electric wire sections thereon,
• said circuit substrate being provided at a part thereof with a through hole or notch, free ends of said parallel electric wire sections being exposed to the outside through said through hole or notch;
• and
• a detection circuit arranged on said circuit substrate to detect the output of the current detection unit by way of said magnetic detection device.