A battery reservation device (10) comprises a battery state acquisition component (12), a scheduled return time acquisition component (13c), a remaining battery charge prediction component (14), a battery station information acquisition component (15), and a reservation acceptance component (17). The battery state acquisition component (12) acquires the remaining battery charge of a battery pack (1) scheduled to be returned to a battery station (30a). The scheduled return time acquisition component (13c) acquires the scheduled return time of the battery pack (1). The remaining battery charge prediction component (14) predicts the remaining battery charge at the time of return on the basis of the current remaining battery charge of the battery pack (1) and the scheduled return time. The battery station information acquisition component (15) acquires the charging speed of a charger (31). The reservation acceptance component (17) accepts a rental reservation for the battery pack (1) scheduled to be returned on the basis of the remaining battery charge at the time of return and the charging speed of the charger (31).