A power transmission system (1, 2, 3) comprising a transmission apparatus (11, 21, 31) and a receiving apparatus (12, 22, 32), wherein the transmission apparatus (11, 21, 31) includes: a first antenna (111, 211, 311); and a first power transmission circuit (112, 212, 312) that outputs electric power via the first antenna (111, 211, 311), the electric power having a first frequency determined by an impedance of a medium (13, 23, 33), an impedance of the first antenna (111, 211, 311), and an impedance of a second antenna (121, 221, 321), the medium (13, 23, 33) being present between the transmission apparatus (11, 21, 31) and the receiving apparatus (12, 22, 32), and the receiving apparatus (12, 22, 32) includes: the second antenna (121, 221, 321); and a second power transmission circuit (122, 222, 322) that receives, via the second antenna (121, 221, 321), the electric power outputted by the transmission apparatus (11, 21, 31), and in a case where a capacitance component that forms the impedance of the first antenna (111, 211, 311) is expressed as C1, a capacitance component that forms the impedance of the second antenna (121, 221, 321) is expressed as C2, a capacitance component of a capacitance that is formed with the first antenna (111, 211, 311), the second antenna (121, 221, 321), and the medium (13, 23, 33) that is present between the first antenna (111, 211, 311) and the second antenna (121, 221, 321) is expressed as C3; and a distance between the first antenna (111, 211, 311) and the second antenna (121, 221, 321) with a coil plane of the first antenna (111, 211, 311) and a coil plane of the second antenna (121, 221, 321) opposing each other is expressed as d, a relationship of 30 cm > C3 × d / (C1 + C2) > 0.5 cm is satisfied. a first antenna (111, 211, 311); and a first power transmission circuit (112, 212, 312) that outputs electric power via the first antenna (111, 211, 311), the electric power having a first frequency determined by an impedance of a medium (13, 23, 33), an impedance of the first antenna (111, 211, 311), and an impedance of a second antenna (121, 221, 321), the medium (13, 23, 33) being present between the transmission apparatus (11, 21, 31) and the receiving apparatus (12, 22, 32), and the receiving apparatus (12, 22, 32) includes: the second antenna (121, 221, 321); and a second power transmission circuit (122, 222, 322) that receives, via the second antenna (121, 221, 321), the electric power outputted by the transmission apparatus (11, 21, 31), and in a case where a capacitance component that forms the impedance of the first antenna (111, 211, 311) is expressed as C1, a capacitance component that forms the impedance of the second antenna (121, 221, 321) is expressed as C2, a capacitance component of a capacitance that is formed with the first antenna (111, 211, 311), the second antenna (121, 221, 321), and the medium (13, 23, 33) that is present between the first antenna (111, 211, 311) and the second antenna (121, 221, 321) is expressed as C3; and a distance between the first antenna (111, 211, 311) and the second antenna (121, 221, 321) with a coil plane of the first antenna (111, 211, 311) and a coil plane of the second antenna (121, 221, 321) opposing each other is expressed as d, a relationship of 30 cm > C3 × d / (C1 + C2) > 0.5 cm is satisfied. the second antenna (121, 221, 321); and a second power transmission circuit (122, 222, 322) that receives, via the second antenna (121, 221, 321), the electric power outputted by the transmission apparatus (11, 21, 31), and in a case where a capacitance component that forms the impedance of the first antenna (111, 211, 311) is expressed as C1, a capacitance component that forms the impedance of the second antenna (121, 221, 321) is expressed as C2, a capacitance component of a capacitance that is formed with the first antenna (111, 211, 311), the second antenna (121, 221, 321), and the medium (13, 23, 33) that is present between the first antenna (111, 211, 311) and the second antenna (121, 221, 321) is expressed as C3; and a distance between the first antenna (111, 211, 311) and the second antenna (121, 221, 321) with a coil plane of the first antenna (111, 211, 311) and a coil plane of the second antenna (121, 221, 321) opposing each other is expressed as d, a relationship of 30 cm > C3 × d / (C1 + C2) > 0.5 cm is satisfied.