PROBLEM TO BE SOLVED: To provide a planting and sowing type field working machine which can easily and effectively solve the problem of low-speed accuracy deterioration in azimuth detection using a satellite.SOLUTION: A planting and sowing type field working machine comprises: a field working apparatus 2； a positioning unit 5 having a GNSS module 50, for outputting positioning data； an automatic steering part 83 for automatically steering a traveling machine body so as to travel along a travel path based on the positioning data and the travel path in a working travel path where the field working machine travels while driving the field working apparatus 2 among calculated travel paths； a low-speed shift state determination part 84 for determining a low-speed shift state in which a travel speed is shifted to a predetermined speed or lower on the basis of a state signal which is output by detecting states of the traveling machine body 1 and the field working apparatus 2； and an automatic steering determination part 82 for stopping the automatic steering if the low-speed shift state has been determined during the execution of the automatic steering.【課題】衛星を用いた方位検出における低速時精度低下の問題を簡単かつ効果的に解消できる植播系圃場作業機。【解決手段】圃場作業装置２と、ＧＮＳＳモジュール５０を有するとともに測位データを出力する測位ユニット５と、算定された走行経路のうちの圃場作業装置２を駆動しながら走行する作業走行経路において、測位データと走行経路とに基づいて走行機体を走行経路に沿うように自動操舵する自動操舵部８３と、走行機体１及び圃場作業装置２の各種状態を検出して出力された状態信号に基づいて走行速度が所定速度以下に移行する低速移行状態を判定する低速移行状態判定部８４と、自動操舵の実行中に低速移行状態が判定された場合、当該自動操舵を停止する自動操舵決定部８２とが備えられている。【選択図】図１
