A foreign object detection device includes coils (242) arranged adjacent to each other on an arrangement surface, each of which is excited and thus generates a vibration signal, and a detector (26) connected to the coils (242) to detect the existence of a foreign object on the basis of the responding signal output from each of the coils (242). The arrangement surface has a first region in which the coils (242) are grouped into a plurality of first coil groups each containing at least two coils (242). The detector (26) detects the existence of a foreign object on the basis of the vibration signal output from each of the coils (242) contained in the first coil groups. The first coil groups contain mutually different combinations of coils (242), and one coil (242) contained in at least one first coil group is also contained in another first coil group.