<p>A charging system that significantly increases the anti-theft capability of a charging subject. The charging subject (1) includes a rechargeable battery (6). The rechargeable battery (6) of the charging subject (1) is connected to a power supply (19) of a house by power lines (20, 18). An authentication management device (22) performs authentication of the charging subject (1) by communicating with the charging subject (1) through the power lines (20, 18) and permits charging of the rechargeable battery (6) with the power supply (19) of the house only when the authentication is established.</p>
