A charging management apparatus includes a vehicle-side earth line connected with an external-side earth line of an external power unit; a vehicle-side signal line connected with an external-side signal line of the external power unit; and a detection signal line configured to connect the vehicle-side signal line and the vehicle-side earth line. Presence or absence of a disconnection of the external-side earth line and the vehicle-side earth line is determined based on an electric current value or a voltage value of the detection signal line, when the external power unit is in a connected state. As a consequence, the on-board charging management apparatus can detect a disconnection of the earth line at the time of charging an on-board electric storage device.