A wireless power transmission system transmitting alternating-current power wirelessly from a power transmission device to a power reception device, wherein the power transmission device comprises: a first and a second electrode (111, 112, 411, 412, 611, 612) which are disposed across a predetermined distance; a first and a second connection line (115, 116, 415, 416, 615, 616) electrically connecting the first and the second electrode (111, 112, 411, 412, 611, 612) and two output terminals of an alternating-current power generating unit, respectively; and a first inductor (113, 114, 413, 414, 613) residing between the first and the second electrode (111, 112, 411, 412, 611, 612) and at least one of the two output terminals of the alternating-current power generating unit, and the power reception device comprises: a third and a fourth electrode (121, 122, 421, 422, 621, 622) which are disposed across a predetermined distance; a third and a fourth connection line (125, 126, 425, 426, 625, 626) electrically connecting the third and the fourth electrode (121, 122, 421, 422, 621, 622) and two input terminals of a load, respectively; and a second inductor (123, 124, 423, 424, 623) residing between the third and the fourth electrode (121, 122, 421, 422, 621, 622) and at least one of the two input terminals of the load, wherein a resonance frequency of a power transmission coupler (110, 410, 610) constituted of the first and the second electrode (111, 112, 411, 412, 611, 612) and the first inductor (113, 114, 413, 414, 613) and a resonance frequency of a power reception coupler (120, 420, 620) constituted of the third and the fourth electrode (121, 122, 421, 422, 621, 622) and the second inductor (123, 124, 423, 424, 623) are set to be substantially equal, characterized in that at least one of the first to the fourth electrode (111, 112, 121, 122, 411, 412, 421, 422, 611, 612, 621, 622) is housed in a conductive casing (310, 320, 510, 520, 710, 720) having an opening (311, 321, 511, 521, 711, 721) corresponding to an opposing electrode. a first and a second electrode (111, 112, 411, 412, 611, 612) which are disposed across a predetermined distance; a first and a second connection line (115, 116, 415, 416, 615, 616) electrically connecting the first and the second electrode (111, 112, 411, 412, 611, 612) and two output terminals of an alternating-current power generating unit, respectively; and a first inductor (113, 114, 413, 414, 613) residing between the first and the second electrode (111, 112, 411, 412, 611, 612) and at least one of the two output terminals of the alternating-current power generating unit, and the power reception device comprises: a third and a fourth electrode (121, 122, 421, 422, 621, 622) which are disposed across a predetermined distance; a third and a fourth connection line (125, 126, 425, 426, 625, 626) electrically connecting the third and the fourth electrode (121, 122, 421, 422, 621, 622) and two input terminals of a load, respectively; and a second inductor (123, 124, 423, 424, 623) residing between the third and the fourth electrode (121, 122, 421, 422, 621, 622) and at least one of the two input terminals of the load, wherein a resonance frequency of a power transmission coupler (110, 410, 610) constituted of the first and the second electrode (111, 112, 411, 412, 611, 612) and the first inductor (113, 114, 413, 414, 613) and a resonance frequency of a power reception coupler (120, 420, 620) constituted of the third and the fourth electrode (121, 122, 421, 422, 621, 622) and the second inductor (123, 124, 423, 424, 623) are set to be substantially equal, characterized in that at least one of the first to the fourth electrode (111, 112, 121, 122, 411, 412, 421, 422, 611, 612, 621, 622) is housed in a conductive casing (310, 320, 510, 520, 710, 720) having an opening (311, 321, 511, 521, 711, 721) corresponding to an opposing electrode. a third and a fourth electrode (121, 122, 421, 422, 621, 622) which are disposed across a predetermined distance; a third and a fourth connection line (125, 126, 425, 426, 625, 626) electrically connecting the third and the fourth electrode (121, 122, 421, 422, 621, 622) and two input terminals of a load, respectively; and a second inductor (123, 124, 423, 424, 623) residing between the third and the fourth electrode (121, 122, 421, 422, 621, 622) and at least one of the two input terminals of the load, wherein a resonance frequency of a power transmission coupler (110, 410, 610) constituted of the first and the second electrode (111, 112, 411, 412, 611, 612) and the first inductor (113, 114, 413, 414, 613) and a resonance frequency of a power reception coupler (120, 420, 620) constituted of the third and the fourth electrode (121, 122, 421, 422, 621, 622) and the second inductor (123, 124, 423, 424, 623) are set to be substantially equal, characterized in that at least one of the first to the fourth electrode (111, 112, 121, 122, 411, 412, 421, 422, 611, 612, 621, 622) is housed in a conductive casing (310, 320, 510, 520, 710, 720) having an opening (311, 321, 511, 521, 711, 721) corresponding to an opposing electrode.