PROBLEM TO BE SOLVED: To provide a farm field management device capable of easily identifying a farm field on which a work vehicle has worked. A management server 3 stores positioning information of a work vehicle 11 including time information and position information, which is located using a satellite positioning system, in a planar space data type (a positioning information storage unit ( A first storage unit) 75, a field information storage unit (second storage unit) 76 that stores field information for identifying the position of at least one field, and a positioning information storage unit (first unit) for each field. Of the positioning information within a predetermined period in the storage unit) 75, the extraction unit 63A that extracts the positioning data included in the field, and the field that identifies the field that the work vehicle has performed based on the extraction result of the extraction unit 63A. The specifying unit 63B is included. [Selection diagram] Fig. 5【課題】作業車両によって作業が行われた圃場の特定が容易となる圃場管理装置を提供する。【解決手段】管理サーバ３は、衛星測位システムを利用して測位された、時刻情報と位置情報とを含む作業車両１１の測位情報を、平面空間データ型で記憶している測位情報記憶部（第１記憶部）７５と、少なくとも１つの圃場の位置を特定するための圃場情報を記憶している圃場情報記憶部（第２記憶部）７６と、圃場毎に、測位情報記憶部（第１記憶部）７５内における所定期間内の測位情報のうち、その圃場に含まれる測位データを抽出する抽出部６３Ａと、抽出部６３Ａの抽出結果に基づいて、作業車両が行った圃場を特定する圃場特定部６３Ｂとを含む。【選択図】図５
