PURPOSE: To provide a hatch setting device which is constituted so that oil in a hatch can be utilized as oil to be delivered next when a tank truck returns with oil left in the hatch.

CONSTITUTION: A hatch setting device 2, when reading vehicle number data from a vehicle number card 27, assigns types and amounts of oil to be loaded into respective hatches 5 of a tank truck 5 based on reservation data. A memory 13 of the hatch setting device 2 incorporates a load setting program for setting oil type data corresponding to reservation data as loaded data when the oil type which has not unloaded from the tank truck 5 is included in the reservation data for next loading of the truck 5 and a hatch assignment program for setting types and amounts of oil to be loaded into the respective hatches of the tank truck 5 based on values wherein the types and amounts of oil of loaded data are subtracted from those of oils included in the reservation data.