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We have confirmed that terrestrial magnetism and acceleration sensors are useful to measure ski jumper's in run descending speed and taking-off positions using a model of ski jumping ramp. Also, we gathered required measurement by inquiring a ski jumping athlete and his coach. As this result, we confirmed following measurement: in run descending speed, jumper's style and posture at jumping point, and slant of body of the jumper when he is flying. We are developing a ski jumper's motion monitoring system using terrestrial magnetism, acceleration sensors, and video camera which enable to monitor such measurements. In this paper, we describe its design and implementation.