Detecting apparatus, power receiving apparatus, power transmitting apparatus, and contactless power supply system

A detecting apparatus, comprising:

• a plurality of coils over a housing;
• a plurality of positioning units over the housing,
• wherein at least one coil of the plurality of coils is wound around at least one positioning unit of the plurality of positioning units,
• wherein the at least one positioning unit maintains the at least one coil at a position on the housing,
• wherein the plurality of positioning units is in a vicinity of at least two coils of the plurality of coils,
• wherein each of the plurality of positioning units comprises a magnetic material, and
• wherein at least one of a real part of a permeability of the magnetic material, an imaginary part of the permeability, outermost dimensions in X, Y, and Z directions, placement in the X, Y, and Z directions, or quantity of units differ among the plurality of positioning units;
• and
• a control circuit configured to detect a foreign matter based on a comparison of at least one electrical parameter of the at least one coil with a threshold value.