Problem to be solved: to provide a posture judgment device capable of determining a posture of a seated person and prompting the seated person to be in a normal posture according to the determined posture.A posture judgment device 10A posture determining apparatus having a seating part S2 and a backrest S1；It is placed on the seat and back.A pressure sensor 4 for measuring a pressure received from a seating personA storage unit 52 for storing the posture information 55 indicating the relationship between the measured value of pressure received from the seating person and the attitude pattern of the seating personMeasurement results measured by pressure sensorsThe attitude pattern of the seated person is determined by comparing the attitude information 55 stored in the memory part.A control section for detecting the hardness of the seam hamstring muscle based on the determined posture pattern.Diagram【課題】着座者の姿勢を判定し、判定された姿勢に応じて着座者に正常な姿勢に促すことが可能な姿勢判定装置を提供する。【解決手段】姿勢判定装置１０は、着座部Ｓ２及び背凭れＳ１を有する姿勢判定装置であって、着座部及び背凭れに設けられ、着座者から受ける圧力を計測する圧力センサ４と、前記着座者から受ける圧力の計測値と着座者の姿勢パターンとの関係を示す姿勢情報５５を記憶する記憶部５２と、圧力センサにより計測された計測結果と、記憶部に記憶された姿勢情報５５とを比較して着座者の姿勢パターンを判定し、判定した姿勢パターンに基づいて着座者のハムストリング筋の硬さを検出する制御部と、を備える。【選択図】図３
