To efficiently charge a battery during power supply by preventing electrical shock due to the contact of a user with a terminal to enhance safety in a power supply device of an electric door gate for imparting a voltage from a power supply terminal fitted to a door stop column to a power receiving terminal fitted to a door stop moving column.

The power supply terminal 11, a transformer 12, a motion sensor 14, and a primary power supply 15 are connected to a control device 70. The control device 70 comprises a control part 71 for controlling the imparting of a voltage to the power supply terminal 11 by ON and OFF of the motion sensor 14 and a power supply control circuit 72 for controlling the imparting of a voltage to the transformer 12 by signals from the control part 71. When the motion sensor 14 detects the door stop moving column, a voltage is imparted to the power supply terminal 11. When the motion sensor does not detect the door stop moving column, it does not impart voltage to the power supply terminal 11.

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