The purpose of the present invention is to detect AE waves with less loss. This sensor attachment device is provided with: a selection means for selecting a solid that experiences at least deformation and/or cracking when loaded, the selection being made in accordance with the size of the solid; and a sensor attachment means that brings a sensor for detecting elastic waves into proximity to a solid selected by the selection means and attaching the sensor thereto, doing so in a different mode depending on the size of the solid.
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