PROBLEM TO BE SOLVED: To provide an outlier detection device for reducing the erroneous detection of a correctly measured measurement value as a outlier in a blood pressure measurement value of a pregnant woman. An outlier detection device obtains a measurement value including a systolic blood pressure value and a diastolic blood pressure value of a pregnant woman, which are sequentially measured under a predetermined condition, and an information of the number of pregnancy days of the pregnant woman and/or Or, based on the variation of the measured value, a threshold value determination unit that changes the threshold value for determining an outlier of the measured value over time, the temporal change of the systolic blood pressure value, the temporal change of the diastolic blood pressure value, And a detection unit that detects an outlier of the measured value based on the threshold value. [Selection diagram] Fig. 3【課題】妊婦の血圧の測定値において、正しく測定できている測定値を誤って外れ値として検出してしまうことを低減する外れ値検出装置を提供する。【解決手段】外れ値検出装置は、所定の条件で順次に測定した妊婦の収縮期血圧値と拡張期血圧値とを含む測定値を取得する取得部と、前記妊婦の妊娠日数の情報及び／又は測定値の変動に基づいて、前記測定値の外れ値を判定する閾値を経時的に変化させる閾値決定部と、前記収縮期血圧値の時間的変化、前記拡張期血圧値の時間的変化、及び前記閾値に基づいて、前記測定値の外れ値を検出する検出部と、を有する。【選択図】図３
