An inter-vehicle transfer apparatus mounted in a vehicle to transfer a signal to another vehicle to which the vehicle is electrically coupled via an electrical coupler, the inter-vehicle transfer apparatus comprising: a pulse transformer including a first coil wound around a core, and wherein a first end of the first coil is connected at one end to the electrical coupler, a capacitor, a first end of which is connected to a second end of the first coil, and a second coil wound around the core in a same direction as the first coil, wherein a first end of the second coil is connected a second end of the capacitor, and wherein a second end of the second coil is connected to the electrical coupler; a first auxiliary coil wound around the core in an opposite direction to the first and second coils (17a, 17b) and having an equal number of turns as the first coil, and wherein a first end of the first auxiliary coil is connected to a second end of the first coil; and a second auxiliary coil wound around the core in an opposite direction to the first and second coils (17a, 17b) and having an equal number of turns as the second coil, and wherein a first end of the second auxiliary coil is connected to the first end of the second coil, wherein a second end of the first auxiliary coil and a second end of the second auxiliary coil are connected to each other to enable application of a direct-current voltage across contact portions in the electrical coupler; the inter-vehicle transfer apparatus further comprising: a direct-current power supply provided between the second end of the first auxiliary coil and the second end of the second auxiliary coil and connected to the first and second auxiliary coils (19b, 19a) in series; and a switch connected to the first auxiliary coil, the second auxiliary coil, and the direct-current power supply in series. a pulse transformer including a first coil wound around a core, and wherein a first end of the first coil is connected at one end to the electrical coupler, a capacitor, a first end of which is connected to a second end of the first coil, and a second coil wound around the core in a same direction as the first coil, wherein a first end of the second coil is connected a second end of the capacitor, and wherein a second end of the second coil is connected to the electrical coupler; a first coil wound around a core, and wherein a first end of the first coil is connected at one end to the electrical coupler, a capacitor, a first end of which is connected to a second end of the first coil, and a second coil wound around the core in a same direction as the first coil, wherein a first end of the second coil is connected a second end of the capacitor, and wherein a second end of the second coil is connected to the electrical coupler; wound around the core in a same direction as the first coil, wherein a first end of the second coil is connected a second end of the capacitor, and wherein a second end of the second coil is connected to the electrical coupler; a first auxiliary coil wound around the core in an opposite direction to the first and second coils (17a, 17b) and having an equal number of turns as the first coil, and wherein a first end of the first auxiliary coil is connected to a second end of the first coil; and wound around the core in an opposite direction to the first and second coils (17a, 17b) and having an equal number of turns as the first coil, and wherein a first end of the first auxiliary coil is connected to a second end of the first coil; and a second auxiliary coil wound around the core in an opposite direction to the first and second coils (17a, 17b) and having an equal number of turns as the second coil, and wherein a first end of the second auxiliary coil is connected to the first end of the second coil, wherein a second end of the first auxiliary coil and a second end of the second auxiliary coil are connected to each other to enable application of a direct-current voltage across contact portions in the electrical coupler; wound around the core in an opposite direction to the first and second coils (17a, 17b) and having an equal number of turns as the second coil, and wherein a first end of the second auxiliary coil is connected to the first end of the second coil, wherein a second end of the first auxiliary coil and a second end of the second auxiliary coil are connected to each other to enable application of a direct-current voltage across contact portions in the electrical coupler; the inter-vehicle transfer apparatus further comprising: a direct-current power supply provided between the second end of the first auxiliary coil and the second end of the second auxiliary coil and connected to the first and second auxiliary coils (19b, 19a) in series; and a switch connected to the first auxiliary coil, the second auxiliary coil, and the direct-current power supply in series. a direct-current power supply provided between the second end of the first auxiliary coil and the second end of the second auxiliary coil and connected to the first and second auxiliary coils (19b, 19a) in series; and a switch connected to the first auxiliary coil, the second auxiliary coil, and the direct-current power supply in series.