Vehicle-rental-system includes: rental-vehicle for rent to user; user-terminal carried by user; and management-server configured to manage operation, locking, and unlocking of rental-vehicle. Rental-vehicle is automatic-drive-vehicle having first-space available for user, and second-space available for luggage. Management-server includes processor and memory. Processor is configured to perform: receiving reservation-information of rental-vehicle transmitted from user-terminal; calculating usage-fee of rental-vehicle based on reservation-information; acquiring payment-information of usage-fee; setting operation-schedule of rental-vehicle based on reservation-information when payment-information is acquired; outputting travel-command to rental-vehicle in accordance with operation-schedule; and outputting unlocking-command of rental-vehicle when rental-vehicle and user-terminal are mutually authenticated. Reservation-information includes usage-information of at least one of first-space and second-space. Processor is configured to perform: outputting unlocking-command includes outputting unlocking-command of at least one of first-space and second-space based on reservation-information when outputting unlocking-command of rental-vehicle.