To improve power transmission efficiency in wireless power feeding by using a magnetic body. A wireless power transmission system 100 feeds power by wireless from a feeding coil L2 to a receiving coil L3 based on a magnetic-field resonance phenomenon between the feeding coil L2 and receiving coil L3. A transmission control circuit 200 supplies AC power to the feeding coil L2 at a drive frequency so as to make the feeding coil L2 feed the AC power to the receiving coil L3. A magnetic body F is disposed between the feeding coil L2 and receiving coil L3. The magnetic body F is disposed in a space between coil surfaces of the feeding coil L2 and receiving coil L3.