Wireless power transfer system and wireless power transfer apparatus

A wireless power transfer apparatus that supplies power to a mobile body provided with a power reception unit including a power reception coil, the wireless power transfer system comprising:

• a power conversion unit configured to generate power to be transmitted to the power reception coil;
• one or more power transmission unit groups that are each constituted by two or more power transmission units, each of the power transmission units having a power transmission circuit including a power transmission coil, and each of the power transmission units receiving a supply of power from the power conversion unit and transmitting power from the power transmission coil to the power reception coil;
• a control unit configured to control the supply of power from the power conversion unit to the one or more power transmission unit groups;
• and
• one or more position detection units configured to detect a position of the mobile body;
• wherein
• the control unit is configured to, based on position information indicating the position of the mobile body detected by the one or more position detection units,
• cause power to be supplied from the power conversion unit to a power transmission unit group that satisfies a power transmission condition among the one or more power transmission unit groups, the power transmission condition including that a distance of the power transmission coil relative to the power reception coil of the mobile body is less than or equal to a predetermined threshold value, and
• not cause power to be supplied from the power conversion unit to a power transmission unit group that does not satisfy the power transmission condition among the one or more power transmission unit groups.