PROBLEM TO BE SOLVED: To provide an agricultural environment control device that can determine sunrise time, sunset time, before noon, afternoon or the like on the basis of changes of solar radiation quantity in a day, reduce labor due to a change of time setting by a user, and by which even a beginner can perform accurate setting.SOLUTION: An agricultural environment control device of the present invention comprises: solar radiation quantity measuring means 10 for measuring at least solar radiation quantity； and control means 20 for calculating the time of time zones created by dividing a day into plural numbers on the basis of solar radiation quantity measured by the solar radiation quantity measuring means 10 or changes of the solar radiation quantity, in which the control means 20 controls a control element 30 being set according to the time zones on the basis of calculated time.SELECTED DRAWING: Figure 1【課題】一日の日射量の変化によって日の出時間や日没時間、午前、午後、などを判断し、ユーザーの時間設定の変更による労力を低減し、初心者でも的確な設定を行うことができる農業用環境制御装置を提供する。【解決手段】本発明の農業用環境制御装置は、少なくとも日射量を測定する日射量測定手段１０と、日射量測定手段１０で測定した日射量又は日射量の変化から、一日を複数に区分した時間帯の時刻を算出する制御手段２０とを備え、制御手段２０では、算出した時刻によって、時間帯に応じて設定している制御要素３０を制御することを特徴とする。【選択図】図１
