A contactless electricity supply device comprising: a second coil configured to send or receive electricity to or from a first coil contactlessly at least through magnetic coupling therebetween, wherein the first coil is provided at a vehicle; a wireless communication section configured to perform wireless communication with the vehicle at a first frequency; an electromagnetic wave sending section or electromagnetic wave receiving section as an electromagnetic wave section configured to perform electromagnetic wave sending or receiving with the vehicle at a second frequency that is different from the first frequency, whereby antennas of the electromagnetic wave section are provided at the periphery and/or the central point of the second coil; and a control section configured to control the wireless communication section and the electromagnetic wave section; wherein the wireless communication section is suitable for long-range communication as compared with the electromagnetic wave section, which is suitable for short-range communication; characterized in that the control section is configured to start up the wireless communication section, first without starting up the electromagnetic wave sending or receiving by the electromagnetic wave section, to sense a distance between the vehicle and the electricity supply device based on signal strength of the wireless communication performed by the wireless communication section, and to defer a timing of starting up the electromagnetic wave sending or receiving by the electromagnetic wave section until the distance between the vehicle and the electricity supply device becomes shorter than a predetermined distance such that: the control section is configured to prevent the electromagnetic wave section from performing the electromagnetic wave sending or receiving with the vehicle normally to avoid radio wave interference with a peripheral device of the vehicle and to allow the electromagnetic wave section to perform the electromagnetic wave sending or receiving only when the distance between the vehicle and the electricity supply device is shorter than the predetermined distance. a second coil configured to send or receive electricity to or from a first coil contactlessly at least through magnetic coupling therebetween, wherein the first coil is provided at a vehicle; a wireless communication section configured to perform wireless communication with the vehicle at a first frequency; an electromagnetic wave sending section or electromagnetic wave receiving section as an electromagnetic wave section configured to perform electromagnetic wave sending or receiving with the vehicle at a second frequency that is different from the first frequency, whereby antennas of the electromagnetic wave section are provided at the periphery and/or the central point of the second coil; and a control section configured to control the wireless communication section and the electromagnetic wave section; wherein the wireless communication section is suitable for long-range communication as compared with the electromagnetic wave section, which is suitable for short-range communication; characterized in that the control section is configured to start up the wireless communication section, first without starting up the electromagnetic wave sending or receiving by the electromagnetic wave section, to sense a distance between the vehicle and the electricity supply device based on signal strength of the wireless communication performed by the wireless communication section, and to defer a timing of starting up the electromagnetic wave sending or receiving by the electromagnetic wave section until the distance between the vehicle and the electricity supply device becomes shorter than a predetermined distance such that: the control section is configured to prevent the electromagnetic wave section from performing the electromagnetic wave sending or receiving with the vehicle normally to avoid radio wave interference with a peripheral device of the vehicle and to allow the electromagnetic wave section to perform the electromagnetic wave sending or receiving only when the distance between the vehicle and the electricity supply device is shorter than the predetermined distance.