PROBLEM TO BE SOLVED: To provide a highly convenient farm field shape generation system and farm field shape generation device for generating highly accurate farm field shape data. A position information acquisition unit (21) that acquires position information of a farm vehicle, and a generation unit (30) that generates field shape data (41) from a travel locus when the farm vehicle travels on the outermost circumference side of the field are provided. The generation unit 30 is configured such that, among a plurality of straight lines connecting adjacent point coordinates in a plurality of point coordinates included in the field shape data 41, the inner angles of the adjacent straight lines are equal to or larger than a predetermined angle and the distance between the point coordinates is equal to or smaller than a predetermined value. If so, the point coordinates that are the intersections of the adjacent straight lines are deleted. [Selection diagram] Fig. 3【課題】精度の高い圃場形状データを生成する利便性の高い圃場形状生成システム及び圃場形状生成装置を提供する。【解決手段】農作業車の位置情報を取得する位置情報取得部２１と、農作業車が圃場の最外周側を走行したときにおける走行軌跡から圃場形状データ４１を生成する生成部３０と、を備え、生成部３０は、圃場形状データ４１に含まれる複数の点座標における隣り合う点座標どうしを結んだ複数の直線のうち、隣接する直線の内角が所定角度以上且つ点座標どうしの間隔が所定値以下であれば、隣接する直線の交点となる点座標を削除する。【選択図】図３
