PROBLEM TO BE SOLVED: To accurately detect the presence/absence of a posture change of a person in bed. SOLUTION: A total load is calculated based on a plurality of load sensors that detect a load applied to a bed, a vibration detection unit that detects a vibration based on outputs of the plurality of load sensors, and an output of the plurality of load sensors. On the bed when the total load calculation unit that does, and the amplitude of the vibration detected by the vibration detection unit is a threshold value or more, and the total load calculated by the total load calculation unit is a reference value or more. A state detection device including a determination unit that determines that the posture of the person in bed has been changed. [Selection diagram] Fig. 11【課題】在床者の体位変換の有無を高精度に検出する。【解決手段】ベッドに加わる荷重を検出する複数の荷重センサと、前記複数の荷重センサの出力に基づき、振動を検出する振動検出部と、前記複数の荷重センサの出力に基づき、総荷重を算出する総荷重算出部と、前記振動検出部により検出される前記振動の振幅が閾値以上であって、前記総荷重算出部により算出される前記総荷重が基準値以上である場合に前記ベッド上の在床者の体位変換があったと判定する判定部と、を有する状態検出装置。【選択図】図１１
