PROBLEM TO BE SOLVED: To provide a field work machine and a mounted object management system for determining a position suitable for supply and discharge before the need for supply and discharge. SOLUTION: A storage unit 90 that stores field information including shape data of a field and unit variation amount information of an on-vehicle object at a unit traveling distance of a machine body, and a work point for supplying or discharging an on-vehicle object in the field are determined. Management unit 92, and a first input unit 47a that receives input of loading amount information of the vehicle-mounted object and stores the loading amount information in the storage unit 90. The management unit 92 manages the field information, unit fluctuation amount information, and loading amount. Determine the work point based on the information. [Selection diagram] Fig. 3【課題】補給や排出の必要が生じる前に、補給や排出に適した位置を決定する圃場作業機及び搭載物管理システムを提供する。【解決手段】圃場の形状データを含む圃場情報と、機体の単位走行距離おける車載物の単位変動量情報とを記憶する記憶部９０と、圃場における車載物の補給もしくは排出を行う作業地点を決定する管理部９２と、車載物の搭載量情報の入力を受け付けて、記憶部９０に記憶する第一入力部４７ａと、を備え、管理部９２は、圃場情報、単位変動量情報、及び搭載量情報に基づいて、作業地点を決定する。【選択図】図３
