PROBLEM TO BE SOLVED: To eliminate a delay and an error of addition acceleration detection. SOLUTION: A movement system is constituted by installing pendulum 15, 16 to a easing 11 fixed to a measuring object through a spring 17. A natural frequency of the movement system is set more than a measuring object- frequency of the measuring object. Electromagnetic detectors 16, 18, which are induced electromotive force proportionally to relative velocity of the pendulums 15, 16 to the casing 1, are installed. Addition acceleration of the measuring object is obtained from the electromotive force detected by electromagnetic detectors.
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