PROBLEM TO BE SOLVED: To improve measurement accuracy of a blood pressure lateral difference of a driver.SOLUTION: A blood pressure lateral difference calculation device 30 comprises: a measurement result acquisition part 321 for acquiring measurement results of a right side blood pressure and a left side blood pressure of a driver of a vehicle 1 from a measurement device 10； a vehicle information acquisition part 322 for acquiring vehicle information which indicates a vehicle state during measurement of the right side blood pressure and the left side blood pressure； and a calculation part 324 for calculating a blood pressure lateral difference, which is a difference between the right side blood pressure and the left side blood pressure based on the measured right side blood pressure and the left side blood pressure in a prescribed vehicle state.SELECTED DRAWING: Figure 1【課題】運転者の血圧左右差の測定精度を向上させる。【解決手段】血圧左右差算出装置３０は、車両１の運転者の右側血圧及び左側血圧の測定結果を測定装置１０から取得する測定結果取得部３２１と、右側血圧及び左側血圧の測定時の車両状態を示す車両情報を取得する車両情報取得部３２２と、所定の車両状態において測定された右側血圧及び左側血圧に基づいて、右側血圧と左側血圧との差である血圧左右差を算出する算出部３２４と、を有する。【選択図】図１
