To detect a connection state between a vehicle side connector and a power supply side connector for connecting an electric vehicle and a power supply device each other and improve reliability and certainty of power supply work.
A female connector 6 having a female terminal and a ring- shaped contact is arranged at an electric vehicle 1, and the female terminal is connected to a battery 3 via lead wire 5. In addition, a male connector 17 having a male terminal and each arc-shaped contact 20 is arranged at a power supply device 10, and the male terminal is connected to a converter 12 via a lead wire 16 or the like. And, when such each arc-shaped contact 20 and ring-shaped contact are electrically connected when the female connector 6 and the male connector 17 are connected to each other.
IWASAKI MANABU
YAGATA HIDEO
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