A management system of an automated valet parking lot according to an example in the present disclosure is a management system of an automated valet parking lot attached to a facility. The management system includes a setting unit for setting a management area for the facility, an authentication unit for performing, when a vehicle is deposited in the automated valet parking lot, usage authentication of the automated valet parking lot with a portable terminal associated with the vehicle, a tracking unit for tracking the position of the portable terminal authenticated for the usage, and a notification unit for notifying the portable terminal of an alarm when the portable terminal is outside the management area.