An apparatus for transmitting power wirelessly using capacitive coupling, provided in a wearable device, includes: a transmission electrode including a plurality of unit electrode pairs, each unit electrode pair being formed by a transmission signal electrode and a transmission ground electrode; and a control module configured to select a unit electrode pair, forming capacitive coupling with the reception electrode, among the plurality of unit electrode pairs provided in the reception electrode, to wirelessly transmit power to a reception electrode included in an implantable device.