PROBLEM TO BE SOLVED: To provide a compression depth calculating device capable of calculating a compression depth accurately even when a compression displacement varies from one compression operation to another.SOLUTION: A compression depth calculating device includes: an acceleration sensor 13 for detecting acceleration of movement of a compressed part of a target due to a compression operation； a magnetic sensor 19 for outputting a coil-to-coil distance AD which is information corresponding to a magnitude of compression on the compressed part of the target due to the compression operation； a first calculation section 233A which obtains a correlation R between a compression depth Da calculated based on second-order integration of the acceleration information acquired from the acceleration sensor 13, and the coil-to-coil distance AD acquired from the magnetic sensor 19； and a second calculation section 233B which calculates a compression depth Dr of a compression operation performed after the correlation R has been calculated, based on the coil-to-coil distance AD acquired from the magnetic sensor 19 and the correlation R, when the compression operation is performed after the correlation has been calculated.SELECTED DRAWING: Figure 2【課題】圧迫動作毎に圧迫変位がバラつく場合であっても、圧迫深度を精度良く算出することが可能な圧迫深度算出装置を提供する。【解決手段】対象物における圧迫動作による圧迫部分の動きの加速度を検出する加速度センサ１３と、対象物における圧迫動作による圧迫部分に対する圧迫の大きさに応じた情報であるコイル間距離ＡＤを出力する磁気センサ１９と、加速度センサ１３から取得した加速度情報の二階積分に基づいて算出した圧迫深度Ｄａと、磁気センサ１９から取得したコイル間距離ＡＤと、の相関関係Ｒを求める第一計算部２３３Ａと、相関関係Ｒが算出された後の圧迫動作の際、磁気センサ１９から取得されるコイル間距離ＡＤと相関関係Ｒとに基づいて、相関関係Ｒが算出された後の圧迫動作の圧迫深度Ｄｒを算出する、第二計算部２３３Ｂと、を備える。【選択図】図２
