FOREIGN OBJECT DETECTION DEVICE AND COIL DEVICE

Reducing size of added search coil disposed to overlap search coil in order to reduce region where foreign object detection is difficult. Foreign object detection device comprises first search coil comprising first coils, second search coil comprising second coils, and control unit. First coils are electrically connected in series such that current flowing through adjacent first coils is in opposite direction, and second coils are electrically connected in series such that current flowing through adjacent second coils is in opposite direction. Wiring comprised each first coils are arranged in parallel and close to each other at boundary portion between adjacent first coils. Control unit determines presence or absence of foreign object by applying voltage to each search coil. Second search coil is arranged such that region surrounded by wiring of second coil overlaps end of boundary portion of first coils.