A wireless power transmission device, comprising: a power feeding unit, the power feeding unit including a feeding-side coil having a primary winding and a primary magnetic core, the primary magnetic core having two principal surfaces that face each other, and a feeding-side shield member having two principal surfaces that face each other, one of the principal surfaces of the primary magnetic core and one of the principal surfaces of the feeding-side shield member being disposed so as to face each other; and a power receiving unit, the power receiving unit including a receiving-side coil having a secondary winding and a secondary magnetic core, the secondary magnetic core having two principal surfaces that face each other, and a receiving-side shield member that has two principal surfaces that face each other, one of the principal surfaces of the secondary magnetic core and one of the principal surfaces of the receiving-side shield member being disposed so as to face each other, the receiving-side coil and the receiving-side shield member being disposed so as to overlap each other, wherein the power feeding unit and the power receiving unit are disposed so that another one of the principal surfaces of the primary magnetic core and another one of the principal surfaces of the secondary magnetic core face each other across the primary winding and the secondary winding, and wherein a distance from a surface of the feeding-side shield member which faces the feeding-side coil to a surface of the feeding-side coil which faces the feeding-side shield member, is longer than a distance from a surface of the receiving-side shield member which faces the receiving-side coil to a surface of the receiving-side coil which faces the receiving-side shield member. a power feeding unit, the power feeding unit including a feeding-side coil having a primary winding and a primary magnetic core, the primary magnetic core having two principal surfaces that face each other, and a feeding-side shield member having two principal surfaces that face each other, one of the principal surfaces of the primary magnetic core and one of the principal surfaces of the feeding-side shield member being disposed so as to face each other; and a feeding-side coil having a primary winding and a primary magnetic core, the primary magnetic core having two principal surfaces that face each other, and a feeding-side shield member having two principal surfaces that face each other, one of the principal surfaces of the primary magnetic core and one of the principal surfaces of the feeding-side shield member being disposed so as to face each other; and a power receiving unit, the power receiving unit including a receiving-side coil having a secondary winding and a secondary magnetic core, the secondary magnetic core having two principal surfaces that face each other, and a receiving-side shield member that has two principal surfaces that face each other, one of the principal surfaces of the secondary magnetic core and one of the principal surfaces of the receiving-side shield member being disposed so as to face each other, the receiving-side coil and the receiving-side shield member being disposed so as to overlap each other, a receiving-side coil having a secondary winding and a secondary magnetic core, the secondary magnetic core having two principal surfaces that face each other, and a receiving-side shield member that has two principal surfaces that face each other, one of the principal surfaces of the secondary magnetic core and one of the principal surfaces of the receiving-side shield member being disposed so as to face each other, the receiving-side coil and the receiving-side shield member being disposed so as to overlap each other, wherein the power feeding unit and the power receiving unit are disposed so that another one of the principal surfaces of the primary magnetic core and another one of the principal surfaces of the secondary magnetic core face each other across the primary winding and the secondary winding, and wherein a distance from a surface of the feeding-side shield member which faces the feeding-side coil to a surface of the feeding-side coil which faces the feeding-side shield member, is longer than a distance from a surface of the receiving-side shield member which faces the receiving-side coil to a surface of the receiving-side coil which faces the receiving-side shield member.