A parking assistance service management device includes a processor configured to receive, from a terminal of a user of a parking assistance service, a use request for using the parking assistance service. The use request includes point information and time information. The processor is configured to extract, in response to the reception of the use request, from a plurality of parking lots, a parking lot that is present within a predetermined range from the point represented by the point information and has an empty parking space at the date and time represented by the time information. The processor is configured to reserve a parking space for the date and time represented by the time information. The information notification unit is configured to notify a terminal of an agent of the parking assistance service and the terminal of the user of reserved parking lot information indicating the reserved parking lot.