PURPOSE: To provide an appropriate delivery base setting device executing an arithmetic processing for installing the appropriate number of delivery bases in appropriate positions in a delivery service area.

CONSTITUTION: A delivery possible distance calculation part 1 obtaining a distance that one delivery base can deliver items based on distance data and data on the number of days, and a delivery base calculation part 2 calculating the positions and the number of the delivery bases installed in the delivery service area are provided from the delivery possible distance and the area data. A delivery service area division part 3 dividing the delivery service areas for the respective delivery bases, a sales results data processing part 4 classifying sales results data for respective items by the small individual delivery areas and storing them, a stock amount calculation part 5 calculating average stock quantity for the respective items in accordance with the sales plan quantity for the respective items, a stock information processing part 6 allocating calculated average stock quantity for the calculated items and calculating appropriate stock quantity for the respective items by the individual small delivery areas according to the sales result data for the respective small delivery area are provided.