PROBLEM TO BE SOLVED: To provide a blood pressure measurement apparatus, a body characteristic information calculation method, and a body characteristic information calculation program which can accurately calculate body characteristic information of a person to be measured with a simple operation.SOLUTION: A blood pressure measurement apparatus 1 comprises a triaxial acceleration sensor and a control unit 13 for outputting information for guiding an arm of a person to be measured, to which the blood pressure measurement apparatus is attached, to a pair of a first posture and a second posture having different positions of a wrist, and determining that the arm of the person to be measured has reached each posture of the pair on the basis of an output signal of the triaxial acceleration sensor after outputting the information. The control unit calculates the forearm length of the person to be measured on the basis of acceleration information during transition detected by the triaxial acceleration sensor during the period from a state in which the arm is in the first posture to a state in which the arm is in the second posture.SELECTED DRAWING: Figure 1【課題】被測定者の身体特徴情報を、簡単な作業により正確に求めることのできる血圧測定装置、身体特徴情報算出方法、及び身体特徴情報算出プログラムを提供する。【解決手段】血圧測定装置１は、３軸加速度センサと、血圧測定装置が装着された被測定者の腕を手首の位置が異なる第一の姿勢及び第二の姿勢のペアに誘導するための情報を出力し、情報の出力後の３軸加速度センサの出力信号に基づいて、被測定者の腕がペアの各々の姿勢になったことを判定する制御部１３と、を備える。制御部は、腕が第一の姿勢になった状態から第二の姿勢になった状態までの期間に３軸加速度センサにより検出された移行中加速度情報に基づいて被測定者の前腕長を算出する。【選択図】図１
