To level the use of a parking lot by making the parking charge different according to the distance to an entrance/exit gate.

This device comprises a detecting means 10 for the registration number and entry time of an automobile entering and exiting from the parking lot and a 1st recording means which records them, a detecting means 21 for the registration number and entry/exit time of an automobile entering and exiting from a parking space provided on each floor of the parking lot and a 2nd recording means 22 which records them, a means 23 which specifies the parking space where an automobile is parked for the longest time, and a means 24 which calculates the parking charge of the automobile from the parking charge per unit time previously set for the specified parking space and the parking time recorded by the 1st recording means.