A power transmission system comprising: a power transmission antenna that includes an oval race-track shaped wound power transmission coil that is placed on the ground; and a power reception antenna that is disposed in such a way as to face the power transmission antenna , includes a wound power reception coil , and receives electric energy from the power transmission antenna via an electromagnetic field, wherein the wound power transmission coil is formed such that it comprises inner and outer edges, and the wound power reception coil is formed such that it comprises inner and outer edges; an area ( S1 ) of a vertical projection of the power transmission coil between the inner and outer edges thereof on a horizontal plane is larger than an area ( S2 ) of a vertical projection of the power reception coil between the inner and outer edges thereof on the horizontal plane; when, in said vertical projection, a distance between the inner edges of the power transmission coil in a predetermined direction is represented by Ti, a distance between the outer edges of the power transmission coil in the predetermined direction is represented by To, a distance between the inner edges of the power reception coil in the predetermined direction is represented by Ri, and a distance between outer edges of the power reception coil in the predetermined direction is represented by Ro, there is relation Ti< Ri < Ro< To; and the predetermined direction is a direction perpendicular to a direction in which a positional shift between the power reception antenna and the power transmission antenna can occur when the power reception antenna is disposed to face the power transmission antenna, wherein the direction in which the positional shift can occur is the direction of the longer axial side of the oval race-track shaped power transmission coil, the predetermined direction and the direction in which the positional shift can occur being both in the horizontal plane. a power transmission antenna that includes an oval race-track shaped wound power transmission coil that is placed on the ground; and a power reception antenna that is disposed in such a way as to face the power transmission antenna , includes a wound power reception coil , and receives electric energy from the power transmission antenna via an electromagnetic field, wherein the wound power transmission coil is formed such that it comprises inner and outer edges, and the wound power reception coil is formed such that it comprises inner and outer edges; an area ( S1 ) of a vertical projection of the power transmission coil between the inner and outer edges thereof on a horizontal plane is larger than an area ( S2 ) of a vertical projection of the power reception coil between the inner and outer edges thereof on the horizontal plane; when, in said vertical projection, a distance between the inner edges of the power transmission coil in a predetermined direction is represented by Ti, a distance between the outer edges of the power transmission coil in the predetermined direction is represented by To, a distance between the inner edges of the power reception coil in the predetermined direction is represented by Ri, and a distance between outer edges of the power reception coil in the predetermined direction is represented by Ro, there is relation Ti< Ri < Ro< To; and the predetermined direction is a direction perpendicular to a direction in which a positional shift between the power reception antenna and the power transmission antenna can occur when the power reception antenna is disposed to face the power transmission antenna, wherein the direction in which the positional shift can occur is the direction of the longer axial side of the oval race-track shaped power transmission coil, the predetermined direction and the direction in which the positional shift can occur being both in the horizontal plane. <EOS>