A charging apparatus includes: a receptacle including terminals; a power supply configured to supply a voltage or a current to a first terminal; a first voltage detector configured to detect a voltage of the first terminal; a second voltage detector configured to detect a voltage of a second terminal at one place, two places or three places away from the first terminal; and a processor. The processor is configured to determine whether the voltage of the second terminal is equal to or higher than a second threshold value during a period in which the voltage of the first terminal is equal to or higher than a first threshold value, and stop supply of the voltage or the current from the power supply to the first terminal in a case in which the voltage of the second terminal is equal to or higher than the second threshold value.