A part cost estimation system including a processing cost information storage device; a shape designating device configured to designate the shape of the part; a processing designating device configured to designate contents of processing to be performed on a material to form the part having the designated shape; a processing facility designating device configured to designate a processing facility; a processing time calculating device configured to calculate a processing time; a processing cost calculating device configured to calculate a processing cost spent on manufacturing the part based on a unit machining cost and the processing cost calculated by the processing time calculating device; and an adding device configured to add the processing cost to determine a cost of the part.