A bone assessment apparatus includes a pair of ultrasonic transducers (14). A plurality of adapters (26, 126) are available so as to easily adjust the position of the calcaneus in accordance with the size of the foot to be examined. A selected adapter (26, 126) is set on a measuring unit (10). The foot is placed on the selected adapter, and the calcaneus is positioned so as to receive ultrasonic sound beams at its center. The measuring unit (10) includes an adapter identifying section (32), and a control operation unit (30) includes a section (44) for checking whether or not a selected adapter is suitable for the member to be examined.