1. A power transmission apparatus comprising:a power transmission circuit configured to wirelessly transmit power to an electronic device;
a foreign substance detection circuit configured to detect a foreign substance affecting power transmission performed by the power transmission circuit;
a loop shaped power transmission antenna serving as an antenna for the power transmission circuit transmitting power to the electronic device; and
a foreign substance detection antenna for the foreign substance detection circuit detecting the foreign substance,
wherein the foreign substance detection antenna is arranged at a predetermined distance or more from the power transmission antenna in a vertical direction to a loop direction of the power transmission antenna, and
wherein the predetermined distance is a distance at which a magnetic field intensity in a range in which the power transmission antenna is arranged falls within 15% from an average magnetic field intensity of the range.