FOREIGN MATTER DETECTION DEVICE

A foreign matter detection device includes: a plurality of detection coils (- to -) between a transmission coil () of a power transmission device () and a reception coil () of a power reception device (), through which power is transmitted in a contactless manner; a plurality of capacitors (- to -) forming, for each of the detection coils, a resonance circuit together with the detection coil; a power supply circuit () supplying AC power having a predetermined frequency to each detection coil; and a detection circuit () detecting a voltage output from each detection coil and detecting a foreign matter entering between the transmission coil () and the reception coil () according to the voltage detected. Then, each detection coil is arranged to overlap by a predetermined amount that allows electromagnetic coupling between adjacent two of the detection coils (- to -) to be ignored.