A wireless power transmitting apparatus comprising: a core assembly including one central coil installed at a first level, and two side coils to transmit a power to a power receiving apparatus , the two side coils including a first side coil and a second side coil ; and a power transmitting unit configured to receive a reception power amount measured by the power receiving apparatus receiving wireless power transmitted from each of the one central coil and the two side coils from the power receiving apparatus , to select any one of the one central coil and the two side coils as a power transmitting coil or to select the one central coil and any one of the two side coils as a power transmitting coil by the received reception power amount, to transmit the power to the power receiving apparatus through the selected power transmitting coil, to judge whether or not a charging completion signal is received from the power receiving apparatus , and to judge whether or not the reception power amount has been decreased, wherein the power transmitting unit is adapted to repeatedly perform the transmission of the power through the selected power transmitting coil when it is judged that the charging completion signal is not received and the reception power amount has not been decreased, and wherein the power transmitting unit is adapted to repeat the coil selection when it is judged that the charging completion signal is not received and the reception power amount has been decreased, wherein the coil selection includes sequentially applying the power to the one central coil and the two side coils and judge the reception power amount transmitted from the power receiving apparatus . a core assembly including one central coil installed at a first level, and two side coils to transmit a power to a power receiving apparatus , the two side coils including a first side coil and a second side coil ; and a power transmitting unit configured to receive a reception power amount measured by the power receiving apparatus receiving wireless power transmitted from each of the one central coil and the two side coils from the power receiving apparatus , to select any one of the one central coil and the two side coils as a power transmitting coil or to select the one central coil and any one of the two side coils as a power transmitting coil by the received reception power amount, to transmit the power to the power receiving apparatus through the selected power transmitting coil, to judge whether or not a charging completion signal is received from the power receiving apparatus , and to judge whether or not the reception power amount has been decreased, wherein the power transmitting unit is adapted to repeatedly perform the transmission of the power through the selected power transmitting coil when it is judged that the charging completion signal is not received and the reception power amount has not been decreased, and wherein the power transmitting unit is adapted to repeat the coil selection when it is judged that the charging completion signal is not received and the reception power amount has been decreased, wherein the coil selection includes sequentially applying the power to the one central coil and the two side coils and judge the reception power amount transmitted from the power receiving apparatus . <EOS>