PROBLEM TO BE SOLVED: To provide a technology for measuring movement of ground surface across a wide area, with a simple configuration and with less labor than before.;SOLUTION: A landslide measurement device for measuring movement of a ground surface of natural ground includes a sound acquisition means which is installed in a region away from the landslide measurement objective region, for acquiring sound from a sound output means which is installed in the landslide measurement objective region whose landslide is to be measured in the natural ground and moves along with movement of the ground surface of the landslide objective region, for output of sound. It also includes a movement measurement means which calculates distance from the sound output means to the sound acquisition means by a plurality of times based on the time required for arrival of the sound acquired by the sound acquisition means, and measures movement of the ground surface of the landslide measurement objective region based on variation in the distances calculated by a plurality of times, and a measurement result outputting means for output of measurement results of the movement measurement means.;COPYRIGHT: (C)2010,JPO&INPIT
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