An osteoporosis progress stage measuring device is configured such that an ultrasonic wave oscillating section (110) oscillates an ultrasonic wave that gives torsional vibration to a bone part of a subject (200), an ultrasonic wave detecting section (120) detects, through the subject (200), an ultrasonic wave attributed to the torsional vibration propagated through the bone part of the subject (200), a CPU (150) calculates, based on the detected ultrasonic wave attributed to the torsional vibration, an attenuation coefficient (attenuation ratio) and a sound speed of the ultrasonic wave, and calculates, based on the calculated attenuation coefficient and the sound speed, a characteristic indicating the progress stage of osteoporosis (bone age) in the bone part of the subject (200). Accordingly, the progress stage of osteoporosis can be measured quantitatively and adequately without placing a significant burden on a body of the subject.
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