To allow efficient automatic travel.SOLUTION: A work management system comprises: a satellite antenna for receiving a satellite signal from a satellite； a satellite positioning module 80 for outputting positioning data corresponding to an own vehicle position on the basis of the satellite signal； a yield output part 20 for outputting a yield measured by the yield sensor 19； a data acquisition part 90 for acquiring positioning data and yield； an area calculation part 84 for calculating an area where the work has been performed of the work region where the work has been performed, and an area where the work has not been performed of a work region where the work has not been performed, on the basis of the positioning data acquired in manual travel； a yield rate calculation part 71 for calculating a yield rate being yield for unit area in the work region where the work has been performed； and a total yield estimation part 72 for estimating a total yield of grains which is expected to be harvested on the work region where the work has not been performed, based on the area of the work region where the work has not been performed and the yield rate.SELECTED DRAWING: Figure 4【課題】効率的な自動走行を行うことを目的とする。【解決手段】衛星からの衛星信号を受信する衛星アンテナと、衛星信号に基づいて自車位置に対応する測位データを出力する衛星測位モジュール８０と、収量センサ１９が測定した収量を出力する収量出力部２０と、測位データ及び収量を取得するデータ取得部９０と、手動走行時に取得した測位データから、既作業地の既作業地面積と未作業地の未作業地面積とを算出する面積算出部８４と、手動走行時に取得した収量と既作業地面積とから、既作業地における単位面積当たりの収量である収量率を算出する収量率算出部７１と、未作業地面積と収量率とから、未作業地で収穫されることが予想される穀粒の総収量を推定する総収量推定部７２とを備える。【選択図】図４
